职称英语考试

试题来源：职称英语模拟题-卫生类-完形填空
【单选题】

A Biological Clock

Every living thing has what scientists call abiological clock that controls behavior. The biological clock tells __1__ whento form flowers and when the flowers should open. It tells __2__ when to leavethe protective cocoon and fly away, and it tells animals and human beings whento 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

试题出处：http://www.examtiku.com/shiti/169592893.html
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：
50%的考友选择了A选项
16%的考友选择了B选项
32%的考友选择了C选项
2%的考友选择了D选项
考友解析与评论：
 · 这题答案有争议，我认为选C、A、B、C、B、A、A、B、B、D、C、A、A、B、C
 · 答案有调整过吗，感觉原先做对了的
 · 这个答案是有歧义