网页资讯视频图片知道文库贴吧地图采购
进入贴吧全吧搜索

 
 
 
日一二三四五六
       
       
       
       
       
       

签到排名:今日本吧第个签到,

本吧因你更精彩,明天继续来努力!

本吧签到人数:0

一键签到
成为超级会员,使用一键签到
一键签到
本月漏签0次!
0
成为超级会员,赠送8张补签卡
如何使用?
点击日历上漏签日期,即可进行补签。
连续签到:天  累计签到:天
0
超级会员单次开通12个月以上,赠送连续签到卡3张
使用连续签到卡
08月29日漏签0天
信阳农业高等专科...吧 关注:27,981贴子:1,328,993
  • 看贴

  • 图片

  • 吧主推荐

  • 视频

  • 游戏

  • 8回复贴,共1页
<<返回信阳农业高...吧
>0< 加载中...

四级题

  • 只看楼主
  • 收藏

  • 回复
  • 未丶眠
  • 侬情依旧
    13
该楼层疑似违规已被系统折叠 隐藏此楼查看此楼

2001年6月份
31. By the time he arrives in Beijing, we ___________ here for two days.
  A)will have stayed B)shall stay C)have been staying D)have stayed
  32. According to the American federal government, residents of Hawaii have the longest life ______ :77.2 years.
  A)rank B)span C)scale D)scope
  33. The millions of calculations involved, had they been done by hand,__________ all practical value by the time they were finished.
  A) had lost B)would have lost C)would lose D)should have lost
  34. As a public relations officer, he is said ________ some very influential people.
  A) to know B) to be knowing C)to have been knowing D)to have known
  35. Our hopes ___________ and fell in the same instant.
  A)arose B)raised C)rose D)aroused
  36. With the development in science and technology man can make various flowers ____________ before their time.
  A) be bloomed B) bloom C) bloomed D)blooming
  37. A season ticket _______the holder to make as many journeys as he wishes within the stated period of time.
  A) entitles B) grants C)bloomed D)promises
  38. _______in the office had a mistake, and the firm regretted causing the customer inconvenience.
  A) Someone B) Some C) Anyone D) One
  39. In recent years much more emphasis has been put _____________ developing the students productive skills.
  A) onto B) in C) over D) on
  40. Only a selected number of landladies in the neighbourhood have been allowed by the university to take in _______ .
  A) residents B) lodgers C) settlers D)inhabitants
  41. The fire was finally brought under control, ___________ extensive damage had been caused.
  A) before B) since C) after D) as
  42. Purchasing the new production line will be a _____________ deal for the company.
  A) forceful B) tremendous C) favorite D)profitable
  43. Rod is determined to get a seat for the concert ___________ it means standing in a queue all night.
  A) as if B) even if C) provided D) whatever
  44. We hadn't met for 20 years, but I recognized her ___________ I saw her .
  A) the moment B) for the moment C) the moment when D) at the moment when
  45. Though he was born and brought up in America, he can speak ___________ Chinese.
  A) fluid B) smooth C) fluent D) flowing
 46. Government reports examination compositions legal documents and most business letters are the main situations ________formal language is used.
  A) in which B) at what C) on which D) in that
  47. Fifty years ago, wealthy people liked hunting wild animals for fun ____________ sightseeing.
  A) rather than to go B) more than going C) other than going D) than to go



  • 未丶眠
  • 侬情依旧
    13
该楼层疑似违规已被系统折叠 隐藏此楼查看此楼

2000年12月份
41. It is important that the hotel receptionist that guests are registered correctly.
〔A〕 has made sure〔B〕 made sure〔C〕 must make sure〔D〕 make sure
42. I suggested he should himself to his new conditions.
〔A〕 adapt〔B〕 adopt〔C〕 regulate D〕 suit
43. I'll never forget you for the first time.
〔A〕 to meet〔B〕 meeting〔C〕 to have met〔D〕 having to be meeting
44. Cancellation of the flight many passengers to spend the night at the airport.
〔A〕 resulted〔B〕 obliged〔C〕 demanded 〔D〕 recommended
45. That young man still denies the fire behind the store.
〔A〕 start 〔B〕 to star 〔C〕 having started 〔D〕 to have started
46. in a recent science competition, the three students were awarded scholarships totaling $21,000.
〔A〕 Judged the best 〔B〕 Judging the best 〔C〕 To be judged the best 〔D〕 Having judged the best
47. Without proper lessons, you could a lot of bad habits when playing the piano.
〔A〕 keep up 〔B〕 pick up 〔C〕 draw up 〔D〕 catch up
48. Everything we eat and drink contains some salt; we can meet the body's need for it from natural sources without turning the salt bottle.
〔A〕 up 〔B〕 to 〔C〕 on 〔D〕 over
49. He always did well at school having to do part\|time jobs every now and then.
〔A〕 in spite of 〔B〕 regardless of 〔C〕 on account 〔D〕 in case of
50. receiving financial support from family, community or the govern ment is allowed, it is never admired.
〔A〕 As〔B〕 Once 〔C〕 Although 〔D〕 Lest
42. 51. All the key words in the article are printed in type so as to attract readers' attention.
〔A〕 dark 〔B〕 dense 〔C〕 black 〔D〕 bold
52. The basic features of the communication process are identified in one question: Who says through what channel to whom?
〔A〕 how 〔B〕 when 〔C〕 what 〔D〕 such
53. I didn't to take a taxi but I had to as I was late.
〔A〕 assume 〔B〕 suppose 〔C〕 mean 〔D〕 hope
54. The hours the children spend in their one\|way relationship with television people undoubtedly affect their relationships with real\|life people.
〔A〕 in which 〔B〕 on which 〔C〕 when 〔D〕 that
55. I'd rather have a room of my own, however small it is, than a room with someone else.
〔A〕 share 〔B〕 to share 〔C〕 sharing 〔D〕 to have shared
56. In Disneyland, every year, some 800,000 plants are replaced because Disney refused to signs asking his "guests" not to step on them.
〔A〕 put down 〔B〕 put out 〔C〕 put up 〔D〕 put off
57. difficulties we may come across, we'll help one another to overcome them.
〔A〕 Wherever 〔B〕 Whatever 〔C〕 However 〔D〕 Whenever
58. So many directors , the board meeting had to be put off.
〔A〕 were absent 〔B〕 been absent 〔C〕 had been absent 〔D〕 being absent
59. On New Year's Eve, New York City holds an outdoor which attracts a crowd of a million or more people.
〔A〕 incident 〔B〕 event 〔C〕 case 〔D〕 affair



2025-08-29 21:02:53
广告
不感兴趣
开通SVIP免广告
  • 未丶眠
  • 侬情依旧
    13
该楼层疑似违规已被系统折叠 隐藏此楼查看此楼
60. American football and baseball are becoming known to the British public through televised from the United States.
〔A〕 transfer 〔B〕 deliveries 〔C〕 transportation 〔D〕 transmissions 来源:考
61. He will surely finish the job on time he's left to do it in his own way.
〔A〕 in that 〔B〕 so long as 〔C〕 in case 〔D〕 as far as
62. If this kind of fish becomes , future generations may never taste it at all.
〔A〕 minimum 〔B〕 short 〔C〕 seldom 〔D〕 scarce
63. The bank is reported in the local newspaper in broad daylight yesterday.
〔A〕 being robbed 〔B〕 having been robbed 〔C〕 to have been robbed 〔D〕 robbed
64. Agriculture was a step in human progress which subsequently there was not anything comparable until our own machine age. 〔A〕 in 〔B〕 for 〔C〕 to 〔D〕 from
65. The same factors push wages and prices up together, the one the other.
〔A〕 emphasizing 〔B〕 reinforcing 〔C〕 multiplying 〔D〕 increasing
66. No one had told Smith about a lecture the following day.
〔A〕 there being 〔B〕 there be 〔C〕 there would be 〔D〕 there was
67. Operations which left patients and in need of long periods of recovery time now leave them feeling relaxed and comfortable.
〔A〕 exhausted 〔B〕 abandoned 〔C〕 injured 〔D〕 deserted
68. I was halfway back to the cottage where my mother lived Susan caught up with me.
〔A〕 when 〔B〕 while 〔C〕 until 〔D〕 though
69. the temperature falling so rapidly, we couldn't go on with the experiment.
〔A〕 Since 〔B〕 For 〔C〕 As 〔D〕 With
70. The bed has been in the family. It was my great grandmother's originally.
〔A〕 handed out 〔B〕 handed over 〔C〕 handed down 〔D〕 handed round
2000年6月份
21 As we can no longer wait for the delivery of our order, we have to _______ it.
A) postpone B) refuse C) delay D) cancel
22 These books, which you can get at any bookshop, will give you _______ you need.
A) all the information B) all the informations C) all of information D) all of the informations
23 Not until the game had begun _______ at the sports ground.
A) had he arrived B) would he have arrived C) did he arrive D) should he have arrived
24 Young people are not _______ to stand and look at works of art; they want art they can participate in.
A) conservative B) content C) confident D) generous
25 Most broadcasters maintain that TV has been unfairly criticized and argue that the power of the medium is _______.
A) granted B) implied C) exaggerated D) remedied
26 These surveys indicate that many crimes go _______ by the police, mainly because not all victims report them.
A) unrecorded B) to be unrecorded C) unrecording D) to have been unrecorded
27 I have no objection _______ your story again.
A) to hear B) to hearing C) to having heard D) to have heard
28 The clothes a person wears may express his _______ or social position.
A) curiosity B) status C) determination D) significance



  • 未丶眠
  • 侬情依旧
    13
该楼层疑似违规已被系统折叠 隐藏此楼查看此楼
29 By law, when one makes a large purchase, he should have _______ opportunity to change his mind.
A) accurate B) urgent C) excessive D) adequate
30 You will see this product _______ wherever you go.
A) to be advertised B) advertised C) advertise D) advertising
31 The early pioneers had to _______ many hardships to settle on the new land.
A) go along with B) go back on C) go through D) go into
32 The suggestion that the major _______ the prizes was accepted by everyone.
A) would present B) present C) presents D) ought to present
33 Beer is the most popular drink among male drinkers, _______ overall consumption is significantly higher than that of women. A) whose B) which C) that D) what
34 Peter, who had been driving all day, suggested _______ at the next town.
A) to stop B) stopping C) stop D) having stopped
35 I didn’t know the word. I had to _______ a dictionary.
A) look out B) make out C) refer to D) go over
36 The professor could hardly find sufficient grounds _______ his arguments in favour of the new theory.
A) to be based on B) to base on C) which to base on D) on which to base
37 There are signs _______ restaurants are becoming more popular with families.
A) that B) which C) in which D) whose
38 I think I was at school, _______ I was staying with a friends during the vacation when I heard the news.
A) or else B) and then C) or so D) even so
39 It is said that the math teacher seems _______ towards bright students.
A) partial B) beneficial C) preferable D) liable
40 In order to show his boss what a careful worker he was, he took _______ trouble over the figures.
A) extensive B) spare C) extra D) supreme
41 — “May I speak to your manager Mr. Williams at five o’clock tonight?”
— “I’m sorry. Mr. Williams _______ to a conference long before then.”
A) will have gone B) had gone C) would have gone D) has gone
42 You _______ him so closely; you should have kept your distance.
A) shouldn’t follow B) mustn’t follow C) couldn’t’ have been following D) shouldn’t have been following
43 The growth of part-time and flexible working patterns, and of training and retraining schemes, _______ more women to take advantage of employment opportunities.
A) have allowed B) allow C) allowing D) allows
44 Everybody _______ in the hall where they were welcomed by the secretary.
A) assembled B) accumulated C) piled D) joined
45 Putting in a new window will _______ cutting away part of the roof.
A) include B) involve C) contain D) comprise
46 Living in the western part of the country has its problems, _______ obtaining fresh water is not the least.
A) with which B) for which C) of which D) which
47 In the _______ of the project not being a success, the investors stand to lose up to $30 million.
A) face B) time C) event D) course
48 The manager would rather his daughter _______ in the same office.
A) had not worked B) not to work C) does not work D) did not work
49 _______, he does get annoyed with her sometimes.
A) Although much he likes her B) Much although he likes her C) As he likes her much D) Much as he likes her
50 The British constitution is _______ a large extent a product of the historical events described above.
A) within B) to C) by D) at


  • 未丶眠
  • 侬情依旧
    13
该楼层疑似违规已被系统折叠 隐藏此楼查看此楼
明天继续吧。。。困了


  • 未丶眠
  • 侬情依旧
    13
该楼层疑似违规已被系统折叠 隐藏此楼查看此楼

31. The medicine is on sale everywhere. You can get it at _______ chemist’s.
A) each B) some C) certain D) any
32. You cannot be _______ careful when you drive a car.
A) very B) so C) too D) enough
33. In general, the amount that a student spends for housing should be held to one- fifth of the total for living expenses. A) acceptable B) advisable C) available D) applicable
34. Every man in this country has the right to live where he wants to, _______the color of his skin.
A) with the exception of B) in the light of C) by virtue of D) regardless of
35. Housewives who do not go out to work often feel they are not working to their full _______.
A) capacity B) strength C) length D) possibility
36. I hate people who _______ the end of film that you haven’t seen before.
A) reveal B) rewrite C) revise D) reverse
37. He’s watching TV? He’s _______ to be cleaning his room.
A) known B) supposed C) regarded D) considered
38. The old couple decided to ________ a boy and a girl though they had three children
of their own.
A) adapt B) bring C) receive D) adopt
39. The government is trying to do something to _______ better understanding between
the two countries.
A) raise B) promote C) heighten D) increase
40. The newspaper did not mention the _______ of the damage caused by the fire.
A) range B) level C) exten D) quantity
41. The soldier was of running away when the enemy attacked.
A) scolded B) charged C) accused D) punished
42. Had he worked harder, he _______ the exams.
A) must have got through B) would have got through C) would get through D) could get through
43. Only under special circumstances _______ to take make?up tests.
A) are freshmen permitted B) freshmen are permitted
C) permitted are freshmen D) are permitted freshmen
44. I had just started back for the house to change my clothes _______ I heard voices.
A) as B) when C) after D) while
45. It seems oil _______ from this pipe for some time. We’ll have to take the machine
apart to put it rignt.
A) had leaked B) is leaking C) leaked D) has been leaking
46. When he arrived, he found _______ the aged and the sick at home.
A) none but B) none other than C)nothing but D) no other than
47. The pressure _______ causes Americans to be energetic, but it also puts them under a constant emotional strain. A) to compete B) competing C) to be competed D) haveing competed
48. Your hair wants _______. You’d better have it done tomorrow.
A) cut B) to cut C) cutting D) being cut
49. As teachers we should concern ourselves with what is said, not what we think _____.
A) ought to be said B)must say C) have to be said D) need to say
50. Once environmental damage _______, it takes many years for the system to recover.
A) has done B) is to do C) does D) is done
51. Studies show that the things that contribute most to a sense of happiness cannot be bought, _______ a good family life, friendship and work satisfaction.
A) as for B) in view of C) in case of D) such as
52. He will agree to do what you require _______ him.
A) of B) from C) to D) for
53. The mere fact _______ most people believe nuclear war would be madness does not mean that it will not occur. A) what B) which C) that D) why
54. John seems a nice person, _______ I don’t trust him.
A) Even though B) Even so C) Therefore D) Though
55. I don’t think it advisable that Tim _______ to the job since he has no experience.
A) is assigned B) will be assigned C) be assigned D) has been assigned
56. _______, a man who expresses himself effectively is sure to succeed more rapidly
than a man whose command of language is poor. \
A) Other things being equal B) Were other things equal
C)To be equal to other things D)Other things to be equal
57. _______ that my head had cleared, my brain was also beginning to work much better.
A) For B) Now C) Since D) Despite
58. The man in the corner confessed to _______ a lie to the manager of the company.
A) have told B) be told C) being told D) having told
59. By 1929, Mickey Mouse was as popular _______ children as Coca-Cola.
A) for B) in C) to D) with
60. Because Edgar was convinced of the accuracy of this fact, he _______ his opinion.
A) struck at B) strove for C) siuck to D) stood for


  • 未丶眠
  • 侬情依旧
    13
该楼层疑似违规已被系统折叠 隐藏此楼查看此楼

31. Although punctual himself,the professor was quite used ______late for his lecture.
  A) to have students  B) for students' being  C) for students to be  D) to students' being
32. You should have been more patient ______ that customer;I'm sure that selling him
  the watch was a possibility.
  A) of  B) with  C) for  D) at
33. Neither of the young men who had applied for a position in the university ______ .
  A) has been accepted  B) have been accepted  C) was accepted  D) were accepted
34. This box is too heavy, ______ give me a hand?
  A) would you mind  B) would you please  C) will you like to  D) will you please to
35. ______ he works hard, I don't mind when he finishes the experiment.
  A) As soon as  B) As well as  C) So far as  D) So long as
36. As early as 1647 Ohio made a decision that free, taxsupported schools must be established in every town ______ 50 households or more. A) having  B) to have  C) to have had  D) having had
37. People appreciate ______ with him because he has a good sense of humor.
  A) to work  B) to have worked  C) working  D) having worked
38. The mad man was put in the softpadded cell lest he ______ himself.
  A) injure B) had injured  C) injured D) would injure
39. We love peace, yet we are not the kind of people to yield ______ any military threat.
  A) up  B) to  C) in  D) at
40. Although he knew little about the large amount of work done in the field, he
  succeeded ______ other more wellinformed experimenters failed.
  A) which  B) that  C) what  D) where
41. If tap water were as dangerous as some people think, ______ would be getting sick.
  A) a lot of more us  B) more a lot of us  C) a lot of us more  D) a lot more of us
42. Living in the central Australian desert has its problems,______ obtaining water is not the least.
  A) for which  B) to which  C) of which D) in which
43. Which sport has the most expenses ______ training equipment, players' personal equipment and uniforms? A) in place of B) in terms of C) by means of  D) by way of
44. They are going to have the serviceman ______ an electric fan in the office tomorrow.
  A) install  B) to install  C) to be installed  D) installed
45. I'm sure he is up to the job ______ he would give his mind to it.
  A) if only  B) in case  C) until  D) unless
46. The car ______ halfway for no reason.
  A) broke off  B) broke down  C) broke up  D) broke out
47. The newcomers found it impossible to ______ themselves to the climate sufficiently to make permanent homes in the new country. A) suit  B) adapt  C) regulate  D) coordinate
48. A ______ to this problem is expected to be found before long.
  A) result  B) response  C) settlement  D) solution
49. You have nothing to ______ by refusing to listen to our advice.
  A) gain  B) grasp  C) seize  D) earn
50. As a result of careless washing the jacket ______ to a child's size.
  A) compressed  B) shrank  C) dropped  D) decreased
51. He hoped the firm would ______ him to the Paris branch.
  A) exchange  B) transmit  C) transfer  D) remove
52. Having decided to rent a flat, we ______ contacting all the accommodation agencies in the city.
  A) set about  B) set down  C) set out  D) set up
53. The relationship between employers and employees has been studied ______.
  A) originally B) extremely  C) violently D) intensively
54. ______their differences. The couple were developing an obvious and genuine affection for each other. A) But for  B) For all C) Above all D) Except for
55. One day I ______ a newspaper article about the retirement of an English professor at a nearby state college. A) came across  B) came about  C) came after  D) came at
56. She was complaining that the doctor was ______ too much for the treatment he was giving her.
  A) expending  B) offering  C) costing  D) charging
57. The manager spoke highly of such ______ as loyalty, courage and truthfulness shown by his employees.
  A) virtue  B) features  C) properties D) characteristics
58. Since the matter was extremely ______ , we dealt with it immediately.
  A) tough  B) tense  C) urgent  D) instant
59. You don't have to be in such a hurry, I would rather you ______ on business first.
  A) would go  B) will go  C) went  D) have gone
60. When I try to understand ______that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.
  A) why it does  B) what it does  C) what it is D) why it is
来源


  • 未丶眠
  • 侬情依旧
    13
该楼层疑似违规已被系统折叠 隐藏此楼查看此楼

1996年6月
21 After the robbery, the shop installed a sophisticates alarm system as an insurance _________ further losses.
  A) for  B) from  C) against   D) towards
22 ___________ the earth to be flat, many feared that Columbus would fall off the edge of the earth.
  A) Having believed  B) Believing  C) Believed  D) Being believed
23 A healthy life is frequently thought to be _______ with the open countryside and homegrown food.
  A) tied  B) bound  C) involved  D) associated
24 Sir Denis, who is 78, has made it known that much of his collection _________ to the nation.
  A) has left  B) is to leave  C) leaves  D) is to be left
25 Before the first non-stop flight made in 1949, it ________ necessary for all planes to land for refueling.
  A) would be  B) has been  C) had been  D) would have been
26 In Britain today women ______ 44% of the workhorse, and nearly half the mothers with children are in paid work.  A) build up  B) stand for  C) make up  D) conform to
27 __________ might be expected, the response to the question was very mixed.
  A) As B) That  C) It  D) What
28 If I correct someone, I will do it with as much good humor and self-restraint as if I were the one ____________.  A) to correct  B) correcting  C) having corrected  D) being corrected
29 Features such as height, weight, and skin color _______ from individual to individual and from face to face.
  A) change  B) vary  C) alter  D) convert
30 I make notes in the back of my diary _________ thing to be mended or replaced.
  A) by  B) in  C) with  D) of
31 The room is in a terrible mess; it _________ cleaned.
  A) can't have been  B) mustn't have been  C) shouldn't have been  D) wouldn't have been
32 A well-written composition __________ good choice of words and clear organization among other things. A) calls on  B) calls for  C) calls up  D) calls off
33 The traditional approach _________ with complex problems is to break them down into smaller, more easily managed problems.  A) to dealing  B) in dealin***ealing  D) to deal
34 It has been revealed that some government leaders _________ their authority and position to get illegal profits for themselves. A) employ  B) take  C) abuse  D) overlook
35 We were struck by the extent ___________ which teachers' decisions served the interests of the school rather than those of the students.  A) to  B) for  C) in  D) with
36 Shelly had prepared carefully for her biology examination so that she could be sure of passing it on her first ____________.  A) intention B) attempt  C) purpose D) desire
37 The ancient Egyptians are supposed _________ rockets to the moon.
  A) to send B) to be sending C) to have sent D) to have been sending
38 The store had to ___________ a number of clerks because sales were down.
  A) lay out B) lay off  C) lay aside D) lay down
39 All the students in this class passed the English exam ________ the exception of Li Ming.



2025-08-29 20:56:53
广告
不感兴趣
开通SVIP免广告
  • 未丶眠
  • 侬情依旧
    13
该楼层疑似违规已被系统折叠 隐藏此楼查看此楼
  A) on B) in C) for D) with
40 Young adults ________ older people are more likely to prefer pop songs.
  A) other than B) more than  C) less than D) rather than
41 Writing is a slow process, requiring ________ thought, time, and effort.
  A) significant B) considerable  C) enormous D) numerous
42 ___________ right now, she would get there on Sunday.
  A) Would she leave B) If she leaves  C) Were she to leave D) If she had left
43 It's already 5 o'clock now. Don't you think it's about time __________?
  A) we are going home B) we go home  C) we went home D) we can go home
44 Lightning is a ________ of electrical current from a cloud to the ground or from one cloud to another.
  A) rush B) rainbow C) rack D) ribbon
45 Today, _________ major new products without conducting elaborate market research.
  A) corporations hardly introduce ever  B) corporations hardly ever introduce
  C) hardly corporations introduce ever  D) hardly corporations ever introduce
46 I've already told you that I'm going to buy it, _________.
  A) however much it costs B) however does it costs much
  C) how much does it cost D) no matter how it costs
47 New York ____ second in the production of apples, producing 850,000,000 pounds this year.
  A) ranked  B) occupied  C) arranged  D) classified
48 Melted iron is poured into the mixer much _________ tea is poured into a cup from a teapot.
  A) in the same way like  B) in the same way which  C) in the same way  D) in the same way as
49 By success I don't mean ________ usually thought of when that word is used.
  A) what is  B) that we  C) as you  D) all is
50 I caught a __________ of the taxi before it disappeared around the corner of the street.
  A) vision B) glimpse  C) look  D) scene 来源: 21. C 22. B 23. D 24. D 25. C 26. C 27. A 28. D 29. B 30. D
  31. A 32. B 33. A 34. C 35. A 36. B 37. C 38. B 39. D 40. D
  41. B 42. C 43. C 44. A 45. B 46. A 47. A 48. D 49. A 50. B



登录百度账号

扫二维码下载贴吧客户端

下载贴吧APP
看高清直播、视频!
  • 贴吧页面意见反馈
  • 违规贴吧举报反馈通道
  • 贴吧违规信息处理公示
  • 8回复贴,共1页
<<返回信阳农业高...吧
分享到:
©2025 Baidu贴吧协议|隐私政策|吧主制度|意见反馈|网络谣言警示