职称英语考试

试题来源：职称英语模拟题-理工类-完形填空

Scientists say they are beginning to learn

Every living thing haswhat scientists call a biological clock that controls behavior. The biologicalclock tells __1__ when to form flowers and when the flowers should open. Ittells __2__ when to leave the protective cocoon and fly away, and it tellsanimals and human beings when to eat, sleep and wake.

Events outside the plant and animal __3__ theactions of some biological clocks. Scientists recently found, for example, thata tiny animal changes the color of its fur __4__ the number of hours ofdaylight. In the short __5__ of winter, its fur becomes white. The fur becomesgray brown in color in the longer hours of daylight in summer.

Inner signals control other biological clocks.German scientists found that some kind of internal clock seems to order birdsto begin their long migration __6__ twice each year. Birds __7__ from flyingbecome restless when it is time for the trip, __8__ they become calm again whenthe time of the flight has ended.

Scientists say they are beginning to learnwhich __9__ of the brain contain biological clocks. An American researcher,Martin Moorhead, said a small group of cells near the front of the brain __10__to control the timing of some of our actions. These __11__ tell a person whento __12__, when to sleep and when to seek food. Scientists say there probablyare other biological clock cells that control other body activities.

Dr. Moorhead is studying __13__ our biologicalclocks affect the way we do our work. For example, most of us have greatdifficulty if we must often change to different work hours. __14__ can takemany days for a human body to accept the major change in work hours. Dr.Moorhead said industrial officials should have a better understanding ofbiological clocks and how they affect workers. He said __15__ understandingcould cut sickness and accidents at work and would help increase a factory'sproduction.

1. A) scientists B) humans C) plants D) animals

2. A) insects B) birds C) fish D) snakes

3. A) effect B) affect C) effected D) affected

4. A) because B) for the reason that C) becauseof D) since

5. A) months B) days C) minutes D) weeks

6. A) flight B) fly C) movement D)transportation

7. A) prevented from B) ordered by C) helped byD) intruded on

8. A) and B) but C) therefore D) however

9. A) portions B) parts C) sections D kinds

10. A) try B) tries C) seem D) seems

11. A) things B) parts C) cells D) actions

12. A) awaken B) wake C) awake D) wake-up

13. A) how B) why C) where D) what

14. A) We B) It C) They D) You

15. A) so B) with C) such D) if

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网考网参考答案：C、A、B、C、B、A、A、B、B、D、C、A、A、B、C
网考网解析：进入考试题库查看解析
大数据分析：根据网考网与考试题库的统计分析，该试题：
33%的考友选择了A选项
1%的考友选择了B选项
60%的考友选择了C选项
6%的考友选择了D选项
考友解析与评论：
 · 这个答案是有歧义
 · 大家看教材，书上原话
 · 我也选了C、A、B、C、B、A、A、B、B、D、C、A、A、B、C到底对不对