唐山一中2009屆高三年級仿真訓練考試 (二)

英   語

說明:

  1.本試卷共11頁，包括三部分，共150分。其中第一部分與第二部分為選擇題，包括65個小題；第三部分為非選擇題。

  2.答題前請仔細閱讀答題卡上的“注意事項”，按照“注意事項”的規(guī)定答題。

  3.所有題目的解答均應在答題卡上做答，在本試卷上和草稿紙上做答無效。作選擇題時，如需改動，用橡皮擦干凈后，再選涂其他答案標號。

4.考試結束后，將本試題和答題卡一并交回。

第I卷（選擇題 共95分）

第一部分  英語知識運用（共三節(jié)，滿分50分）

第一節(jié)  語音知識（共5小題；每小題1分，滿分5分）

    從A、B、C、D四個選項中，找出其劃線部分與所給單詞的劃線部分讀音相同的選項，

并在答題卡上將該項涂黑。

例：have         A. gave       B. save       C. hat       D. made        答案是C.

1. wealth             A. wheat     B. weakness   C. great     D. meant

 2. advise       A. tense      B. surprise           C. practise  D. defense

 3. allow          A. shower     B. flow        C. fellow    D. narrow   

 4. months        A. baths      B. mouths      C. paths     D. strengths

 5. delicious       A. declare     B. district     C. medicine  D. special

第二節(jié)  語法與詞匯知識（共15小題；每小題1分，滿分15分）

    從A、B、C、D四個選項中，選出可以填入空白處的最佳選項，并在答題卡上將該項

涂黑。

例：We _____ last night, but we went to the concert instead.

    A. must have studied                    B. might study

    C. should have studied                   D. would study

    答案是C。

 6. It’s quite _______ honor to be _______ chairman of the conference.   

   A. /; the             B. a; /                C. an; /              D. the; the

7. How can they learn so much _______ they spend such a lot of time hanging about? 

  A. although          B. when              C. before             D. until

8. The selfless village doctor treated any poor patient who came to his house without any ____.

  A. cost              B. payment           C. charge            D. price

9. I still remember how many years ago _______ I last met her in the countryside.  

  A. when it was       B. was it that          C. when was it        D. it was that

10. _______ in a poor family made Jack very hardworking when he was still young.

   A. Bringing up       B. Being brought up    C. Having brought up   D. Brought up

11. They all say I’m beginning to look a little overweight, so I’m afraid I need ______ exercise to stay in good ______. 

   A. regular; shape     B. common; situation    C. usual; condition  D. standard; state

12. ― Did you enjoy the movie?

   ― Sure, it is ______ a beautiful country town with a variety of cultures.   

   A. put on           B. set in              C. taken on           D. got in

13. Reality is not the way you wish things to be, nor the way they appear to be, ______ the way they actually are.   

   A. as               B. or               C. but                D. and 

14. We live day by day, but in the great things, the time of days and weeks ______ so small that a day is unimportant. 

   A. is               B. are              C. has been            D. have been

15. ― What happened to you the other day?

   ― I _______ to Beijing, but I missed my flight.    

   A. would fly        B. was going to fly       C. had flown          D. flew

16. Short and shy, Ben Saunders was the _______ kid in his class picked for any sports team.

   A. very            B. only             C. last                D. right

17. ― What’s the trouble with you?

   ― _______ the terribly heavy box, my waist was hurt unexpectedly.  

   A. Lifted          B. Lifting           C. While I was lifting    D. While lifting

18. The school rules state that no child ______ be allowed out of school during the day, unless accompanied by parents.  

   A. can            B. shall             C. must               D. should

19. I’m glad to introduce Mr. Smith to you, without ______ consideration our project would have ended in failure.   

   A. whom          B. his              C. whose              D. who

20. Only those who have experienced hardship ______ well aware of what happiness means. 

   A. can they be      B. they can be       C. can be              D. they can

第三節(jié) 完形填空（共20小題；每小題1.5分，滿分30分）

　  閱讀下面短文，從短文后所給各題的四個選項（A、B、C和D）中，選出可以填入

空白處的最佳選項，并在答題卡上將該項涂黑。

    It was past 10:00 pm. I was busy with my schoolwork though I was   21  . Just then my little brother Michael ran out of his room,   22   a pen in his right hand and a piece of paper in the other.

    “Betty, can you help me with my   23   for school? It’s about the seven   24   of the world.” He said.

    My eyes were so   25   on the computer screen that my brother had to pull my blouse just to get my   26  .

    “Look, not right now! I’m very busy.” I said. “You’re always busy! You’re always like

that!” he replied.

     I felt a bit guilty（愧疚）   27   I thought about his words, but my work seemed more  

  28    to me than my brother’s. I sighed a few times and   29    with my own studies.

    The next day, I arrived home late. Michael came into my room.

    “I know you are   30  , but there’s something I want to show you”, he began. Without saying a word, I   31   the paper from him. I really didn’t   32   what he was saying. All I wanted was to   33   him and finally get to rest.

    Suddenly, my eyes widened in   34  . There, he wrote:

    The Seven Wonders of the World  1. Love   2. Friendship   3. Peace   4. Joy   5. Wisdom   6. Fun  7. Family

    I   35   believe what my brother had written on the paper. I was completely   36  .

How could such an innocent（天真的）little child   37   such things in life?

    The most valuable things in life are the ones that we   38   take for granted. These things don’t take the form of big houses or beautiful   39  . The most wonderful things in the world are immaterial（非物質的）   40   they can never be developed by human art, skill or effort.

21. A. tired                 B. experienced       C. talented            D. satisfied

22. A. buying            B. holding                C. playing                       D. biting

23. A. problem         B. mistake                 C. trouble                 D. homework

24. A. events           B. cities                  C. wonders                   D. mysteries

25. A. paid                   B. attracted                  C. applied              D. fixed

26. A. attention        B. care                          C. love                    D. concern

27. A. before                 B. as                        C. since                  D. till

28. A. practical         B. useful                         C. important           D. interesting

29. A. started            B. hated                           C. forgot                   D. continued

30. A. busy                B. bored                   C. free                       D. tiring

31. A. handed          B. took                     C. got                      D. accepted

32. A. record                    B. worry                    C. mind                         D. share

33. A. get on well withB. keep up with          C. make fun of        D. get rid of

34. A. surprise            B. sadness                  C. happiness        D. disappointment

35. A. shouldn’t        B. needn’t                C. couldn’t             D. mustn’t

36. A. wounded              B. lost                         C. pleased              D. puzzled

37. A. understand           B. remember          C. study                         D. finish

38. A. ever               B. often                     C. seldom               D. never

39. A. voices                     B. poems                        C. cars                       D. music

40. A. if                   B. when                         C. but                    D. and

第二部分  閱讀理解（共25小題，第一節(jié)每小題2分，第二節(jié)每小題1分；滿分45分）

第一節(jié)        閱讀下列短文，從每題所給的四個選項（A、B、C和D）中，選出最佳選項，并在答題卡上將該項涂黑。

A

There were two things in the world that Ghagra Geeta Bali hated. The first was the way, Rani, the domestic help, combed her hair. The second was, you guessed it, her name. She hated her name so much that she prayed to God every night: Dear God, let me be born again. So I can have a name like Rita or Preeti. A short, smart one-word name.

On Tuesday, Ghagra Geeta Bali and her mother went for their usual shopping. There was a long queue of children just outside the record store. They went closer to look. It was yet another scheme to sell a few audio cassettes. Everyone who bought a cassette qualified for the scheme.

In this case, the artist whose songs were featured on the cassette was a young sensation called Malik Faridabadi, a great favorite with teenagers. Ghagra Geeta Bali was no exception.

A friendly young man was writing down the names of the people who wanted to participate in the scheme. Out of this long list Malik would pick one name, and the chosen one would get to meet him, plus of course, win many freebies (贈品).

But when her mother asked her to participate, Ghagra Geeta Bali said no. She didn’t want to speak out her name in front of so many people and make herself the butt (笑料) of amusement. But mothers being mothers, she just went up to the man and told him in firm tones: “Please enter my daughter’s name. It is Ghagra Geeta Bali.”

“It is what?” the man asked, naturally a little taken aback.

“G-h-a-g-r-a G-e-e-t-a B-a-l-i. There she is.” she replied while pointing to her daughter. The crowd standing around also turned to stare. All Ghagra Geeta Bali wanted then was for the earth to open up and swallow her.

That did not happen. But the following week she received a call. It was from the recording company that had announced the scheme. And they told her that she was the chosen one.

“It is all because of your name,” said that public relations man who had called. “Mr. Faridabadi took one look at it in the list and said that he couldn’t wait to meet the brave girl.”

41. Ghagra Geeta Bali didn’t like her name because ______.

A. it would bring her a lot of trouble          B. it was too long and not beautiful

C. it would make her angry                     D. it was too ugly and dull

42. When the girl saw the crowd turn to stare at her, she felt ______.

A. scared         B. shocked         C. embarrassed         D. disappointed

43. What is the message of the story?

A. Mother’s love makes all the difference.

B. Children should always trust their parents.

C. One should be brave to meet anything strange.

D. Something that one thinks is bad may turn out good.

B

Tiny tot’s big adventure: Super Baby, a multimedia children’s play co-produced by Beijing Children’s Art Theater and Yeowoobi Animation Company of South Korea, is running at Beijing’s Cultural Palace of Nationalities.
   Adapted from a popular South Korean cartoon book by Korean writer Cho Soo Min , the play tells the story of the boy named Siqing, who sets out in search of adventure with his friend Weiwei, a dinosaur, and a panda to rescue his kidnapped grandfather. In director Hang Cheng’s eyes, it is a story of hope, dreams and courage. He says it is a Chinese interpretation of Alice’s Adventure in Wonderland, and Cheng hopes it could inspire the young audience members to love one another, treasure friendship and pursue their dreams.
    Time: 7:30pm, until August 26
    Place: 49 Fuxingmen Nandajie Street, Xicheng District
    Tel: 5905 ? 9082
    Lords of the rings: The Chinese Acrobatics Group, established in 1950, will put on a performance that includes traditional acrobatics, circus, magic, old Beijing folk plays and more.
The show blends music, dance, local opera and martial arts with acrobatics.
    Time: 7:30pm, daily
    Place: Tiandi Theater, Dongsi Shitiao, Chaoyang District
    Tel: 6416 ? 9893
    Fooling around: Dashan is taking to the stage with the otherwise all-Chinese cast of Chaoji Bendan, or Super Idiot. The play is an adaptation of the famous French comedy, Le diner de Cons (The dinner Game). Dashan, or Mark Rowswell, is a Canadian who became a household name and popular TV host who speaks superb Chinese. He plays the role of Pierre Brochant, a successful Parisian publisher, who attends a weekly “idiots’ dinner”. Each guest must bring along an “idiot” for the amusement of the other invitees. At the end of the dinner, the evening’s “champion idiot” is selected.
    Time: 7:30pm, September 29~30
    Place: Poly Theater, 14 Dongzhimen Nandajie, Dongcheng District
    Tel: 6416 ? 9990
    Classic comeback: Chinese drama classic The Top Restaurant (Tianxia diyilou) will be staged by Beijing People’s Art Theater. Written by He Jiping, the drama has been one of the most popular Chinese theatrical works performed by the renowned Beijing People’s Art Theater. It has been staged more than 400 times since the premiere.
    Time: 7:30pm, September 5~14
    Place: Capital Theater, 22 Wangfujing Dajie
    Tel: 6524 ? 9847
    Order now, you can get a 20% discount. More information, please click Here.

44. If you want to enjoy magic on Sunday, you can go to              .
A. Red Theater       B. Tiandi Theater     C. Poly Theater     D. Capital Theater

45. The advertisements are about               .
A. exhibitions             B. meetings     C. stage performances       D. western cultures

46. Which of the following is NOT true according to the passage?
A. Super Baby, a children’s play, is performing at Beijing’s Cultural Palace of Nationalities.
B. The Chinese Acrobatics Group can perform old Beijing folk plays.
C. Dashan is a popular TV host who speaks superb Chinese.
D. The Top Restaurant will be performed by He Jinping.

47. This passage is most probably taken from               .
A. a textbook        B. a magazine         C. a newspaper         D. a website

C

The income gap between China’s rural and urban residents (居民) has continued to widen during the past few years in spite of rapidly rising rural incomes, Agricultural Minister Sun Zhengcai said here on Wednesday.
      The income ratio (比率) between urban and rural residents was 3.28:1 in 2006, against 3.23:1 in 2003, said Sun in his report on the promotion of building a new countryside in 2007. Sun also said the net income（純收入）of rural residents in different regions also varied. The income gap is only one of several problems in rural areas, according to Sun’s report. While listing the achievements in rural areas in recent years, Sun believed that rural development still followed behind urban development.
     “We have bigger pressure to ensure the supply of major agricultural products such as grain.” he said. “China’s urbanization (都市化) has been speeded up and more rural residents have gone to urban areas.” he said.
     “In this case, more agricultural producers become farm produce consumers, which created more pressure for supply.” he said.
     Another problem facing China’s agricultural development is inadequate application of science and technology.
     “Only 30 percent of scientific and technological achievements have been applied to agricultural production, which is 40 percentage points lower than developed countries.” he said.
     Despite increased government spending in rural areas, the infrastructure (基礎下部組織) is still poor and easily hit by disasters.
     According to Sun, the government spent 431.8 billion yuan ($59.15 billion) on agriculture, rural areas and farmers this year, an increase of 80.1 billion yuan over the previous year.
     “China set aside 11.38 billion yuan to promote a new rural cooperative medical care system and 27.98 billion yuan to support the new compulsory education mechanism in rural area to ensure that all citizens shared the fruits of China’s reform and opening-up.” Sun said.

48. Which of the following is TRUE according to the text?
A. Because of the rapidly rising rural incomes, the income gap between China’s rural and urban residents will disappear this year.
B. The net income of rural residents in different regions is the same.
C. The government has taken measures to develop the economy in the rural areas.
D. Because of the rapidly rising rural incomes, the supply of major agricultural products is

enough.

49. How much is spent on agriculture, rural areas and farmers the previous year?

A. 431.8 billion yuan   B. 511.9 billion yuan    C. 351.7 billion yuan   D. 80.1 billion yuan
50. Which is NOT the problem in rural areas?
   A. The income gap         B. The inadequate application of science and technology
   C. The supply of major agricultural products         D. China’s urbanization

51. Can you infer the meaning of the underlined word in paragraph 5?
A. be made full use of                         B. be made little use of  

C. be not made full use of                   D. be made good use of

D

Noah’s Ark（諾亞方舟）has set sail again. Crossing stormy scientific waters, today’s ark is not carrying animals two by two to safety. Rather, it could produce unlimited numbers of presently endangered animals.

Noah is the name given in advance to the clone of a dead gaur, a rare type of endangered wild ox found in India, Bangladesh and Southeast Asia. The new Noah is expected to be born any day now to Bessie, a cow living on a farm in Iowa. Cows have given birth to gaurs before, but Advanced Cell Technologies, a small biotechnology company in Massachusetts, is using a cross-species nuclear-transfer technique to clone a different species.

Bessie’s ultrasound（超聲）tests look good, but is the concept a sound one？Robber Lanza, ACT’s vice president of medical and scientific development, says that technique “presents exciting possibilities” that may help rescue endangered species and perhaps even reverse（逆轉）extinctions. Other scientists argue that such approaches are unlikely to make a significant contribution to the support of the endangered species, especially if their habitats have been destroyed.

If Bessie’s little gaur is delivered safely, the birth will come as an encouragement to many biologists in the US and Europe who are engaged. In particular, though, Noah’s arrival will hearten the scientists at ACT, who recently signed a deal with Spanish officials to attempt to clone the bucardo, an extinct mountain goat native to the Pyrenees Mountains. The last bucardo died a year ago. Scientists had already kept a quantity of its cells, and ACT hopes to transfer them into other goats’ eggs some time soon.

52. What is the best title for this passage?

   A. Clone.    B. Research on Clone.    C. Endangered Species.   D. Noah’s New Ark.

53. Which is TRUE according to the passage?

   A. Noah’s Ark has set sail again to carry animals two by two to safety.

   B. Some argued about disapproval of the clone of the new Noah.

   C. Noah is the name of a cloned gaur found in Pyrenees Mountains a year ago.

   D. Bessie is a rare type of endangered wild ox.

54. Advanced Cell Technologies _______.

   A. has produced unlimited numbers of presently endangered creatures

   B. is a global biotechnology firm

   C. is trying out a cross-species nuclear-transfer technique

   D. has succeeded in cloning unlimited animals

55. How many clone tasks are mentioned for ACT?

   A. One.          B. Two.           C. Three.             D. Four.

E

The Internet is redrawing the media landscape and will be for decades to come, but traditional media will not be left out of the picture, argue two University of Alabama, Tuscaloosa, journalism professors. Ed Mullins, chairman of the Journalism Department, and Jim Stovall, the founder of Dateline Alabama, the news website of the College of Communication and Information Sciences, agree that the future of the web is still a mystery, but argue that, in the near future, it will serve more as a helpmate to traditional media.

“Nobody knows where the web is taking us, but when it comes to journalism, old media will be dominant (most noticeable) players in the new media game.” Mullins believes. “A report goes that most Americans go to sites operated by old-line media when looking for news on the web.”

Just as national old media dominate the web at that level, local old media run mostly by newspapers and, to a lesser degree, by television stations dominate those markets. Is there a pattern here? “Yes.” says Mullins and Stovall. “At least in the first decade of the web, newspaper companies dominate web journalism,” Mullins explains. “Why? They specialize in news, and that gives them an advantage. What most readers go to websites for is news and e-mail, a form of person-to-person news, especially in the form of chatting.”

The reason for newspapers’ dominance in web journalism, Stovall points out, is that they put the biggest money in news. “The Birmingham News, for example, with about 175 positions, has more journalists on its payroll（薪水冊）than all of the state’s broadcast, cable, and web.”

56. What is the best title for the passage?

A. Internet won’t get rid of print media.      B. Internet challenges traditional media.

C. Looking national local news on the web. D. Journalism should be dominated by web.

57. What is the author’s attitude towards the future of traditional media?

A. Doubtful.       B. Worried.        C. Concerned.        D. Optimistic.

58. Traditional media dominate web journalism because ________.

A. news and advertising are their only business

B. they hire more journalists to work for them

C. web companies dare not compete with them

D. they enjoy special advantages in journalism

59. What role does the Internet play in journalism according to Paragraph 1?

A. It will someday dominate the media market.

B. It is likely to threaten the future of print media.

C. It will become a helpful partner of print media.

D. It will revolutionize traditional journalism.

60. The following prove that old media still dominate web journalism except ______.

A. people prefer traditional media when looking for news

B. old media have the most important position in local markets

C. newspaper companies have more control in web journalism

D. few people go to websites to get national and local news

注意：將61-65題答案涂在答題卡上71-75題處。

第二節(jié)：根據(jù)對話內容，從對話后的選項中選出能填入空白處的最佳選項，選項中有兩項

為多余選項。

Policeman：Now, Jimmy, did you get a good view(看清) of the accident?
Jimmy：Oh, yes. I was standing outside the bank building and I saw it quite clearly.
Policeman：Do you know what time it was?
Jimmy：Yes.    61    It was 2:45 exactly.
Policeman：Good.     62   
Jimmy：Well, quite slowly ― about 10 miles an hour. It was coming up York Road.    63  

But they were still red when he went over them.
Policeman：I see.    64    Was it also driving slowly?
Jimmy：It was coming along Union Street about 30 miles per hour. It was a blue Toyota.

    65  
Policeman：Did you see what colour his traffic(交通) light was?
Jimmy：Yes, it changed to yellow just before he crossed it.
A. What about the car?
B. I checked my watch.
C. Didn’t you see the car?
D. Now, how fast was the truck moving?
E. Was the car going beyond the speed limit?
F. I suppose the truck driver knew the lights were going to change.
G. The driver stopped his car when he saw the truck crossing the street.

第II卷 (非選擇題 共55分)

第三部分 寫作（共三節(jié)，滿分55分）

第一節(jié)  單詞拼寫（共10小題；每小題1分，滿分10分）

根據(jù)下列句子及所給漢語注釋，在句子右邊的橫線上寫出空缺處各單詞的正確形式。（每空只寫一詞）（請在答題卡上的指定位置做答）

66. The bus was so         (擁擠) that I had to stand.                            66.     

67.          (吵架) with his classmates, Tom didn’t notice his teacher come in.                                                                          

                                                                        67. ______                                                      

68. The longer she waited for the bus，the         (生氣) she grew.     68. ______

69. I must          (警告) you beforehand that I will tell Sybil everything.   69. ______

70. The book shows the author’s          (深度) of learning.                        70. ______

71. She often          (描述) how she narrowly escaped the earthquake.       71.______

72. We are fond of playing          (排球).                                              72. ______

73. In the restaurant both Chinese and European          (菜單) are provided.

                                                                                                                73. ______

74. Credit cards are          (廣泛) accepted.                                       74. ______

75. After the battle they          (掩埋) the dead and moved on.            75. ______

第二節(jié)：短文改錯（共10小題；每小題1.5分，滿分15分）

此題要求改正所給短文中的錯誤。對標有題號的每一行做出判斷：如無錯誤，在該行右邊橫線上畫一個勾（√）；如有錯誤（每行只有一個錯誤），則按下列情況改正：此行多一個詞：把多余的詞用斜線（＼）劃掉，在該行右邊橫線上寫出該詞，并也用斜線劃掉。

此行缺一個詞：在缺詞處加一個漏字符號（），在該行右邊橫線上寫出該加的詞。

此行錯一個詞：在錯的詞下劃一橫線，在該行右邊橫線上寫出改正后的詞。

注意：原行沒有錯的不要改。

（請在答題卡上的指定位置做答）

The first fact I worry is noise pollution. People can’t sleep             76. _______

well if there is too much noise. That’s why such many people        77. _______

prefer to live in the countryside rather than living in noisy cities.     78. _______

I suggest all the factories and cars not make terrible noise. Although   79. _______

they make terrible noise that are not allowed, they should be fined,   80. _______

and we can also produce cars which don’t make terrible noise.   81. _______

Another pollution is rubbish pollution. If nobody makes so much    82. _______

rubbish, one day we may live in a world filling with rubbish.           83. _______

Some people throw waste paper about. I suggested rubbish         84. _______

should be put into different kinds of dustbins or papers bags.         85. _______

第三節(jié)：書面表達 （滿分30分）

    右面4幅圖片描述

的是星期天上午在中山

公園里發(fā)生的一件事。

請根據(jù)圖片所提供的信

息用英語為你校的“英

語園地”寫一篇短文。

注意：1.短文須包括所

有圖片的主要內容。短

文的內容要連貫、完整。

2.參考詞匯：貨攤stand

(n.)  搶奪snatch (v.)

逮捕arrest (v.)

3. 字數(shù)：100詞左右（已   

給出部分不計入總

詞數(shù)）

（請在答題卡上的指定位置做答）

One Sunday morning, there were some people in Zhongshan Park.                    

唐山一中2009屆高三年級仿真訓練考試 (二) 答案

英語

1 ? 5  DBADD      6 ? 10   CBCDB       11 ? 15  ABCAB   16 ? 20   CCBCC 

21 ? 25  ABDCD      26 ? 30  ABCDA      31 ? 35  BCDAC    36 ? 40   DABCD

41 ? 45  BCDBC      46 ? 50  DDCCD      51 ? 55   CDBCB   56 ? 60   ADBCD   

61 ? 65  BDFAG

66. crowded     67. Quarrel(l)ing      68. angrier     69. warn        70. depth      71. describes      72. volleyball          73. menus       74. widely      75. buried

76. worry 后加about       77. such 改為 so     78. living改為live       79. Although改為If   80. are改為is    81. 正確     82. nobody改為everybody / everyone    

83. filling改為filled       84. suggested改為suggest      85. papers改為paper

One possible version

One Sunday morning, there were some people in Zhongshan Park. At a stand, a woman was

buying an ice-cream when a young man behind her snatched her handbag away. Hearing the shouting “stop him”, a few people began to run after him. There was an old man sitting quietly on a bench nearby and as the snatcher was running past him, the old man quickly picked up his umbrella and put it between the snatcher’s legs, so the young man fell down on the ground hard. Soon two policemen came in a police car and arrested him. At last, the woman thanked the old man, and the people around praised the old man for his cleverness.

試題詳情

華南師大附中2007―2008學年度高三綜合測試（二）

數(shù)學試題（文科）

選擇題：本大題共10小題，每小題5分，共50分.

1．已知曲線的一條切線的斜率為，則切點的橫坐標為                           （    ）

       A．1                        B．2                        C．3                        D．4

2．若A                                              （    ）

       A．2                        B．±2                     C．2、－2或0         D．2、－2、0或1

3．函數(shù)的最小正周期是                                                              （    ）

       A．                    B．4                    C．                      D．

4．若θ是第二象限的角，則下列四個值中，恒小于零的是                                     （    ）A．    B．                                C．               D．cot

5．在各項都為正數(shù)的等比數(shù)列{a_n}中，a₁=3，前三項的和為21，則a₃+ a₄+ a₅=     （    ）

       A．33                      B．72                      C．84                      D．189

6．已知上是單調增函數(shù)，則a的最大值是                       （   ）

       A．0                        B．1                        C．2                        D．3

7．已知定義在R上的函數(shù)是偶函數(shù)，對時，的值為                                                                            （    ）

       A．2                        B．－2                     C．4                        D．－4