2014年职称英语考试综合类模拟题（五）

　　第六部分：完型填空 (第51～65题，每题1分，共15分)

　　阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上。

　　A Biological Clock

　　Every living thing has what scientists call a biological clock that controls behavior. The biological clock tells 5l when to form flowers and when the flowers should open. It tells 52 when to leave the protective cocoons and fly away, and it tells animals and human beings when to eat, sleep and wake.

　　Events outside the plant and animal 53 the actions of some biological clocks. Scientists recently found, for example, that a tiny animal changes the color of its fur 54 me number of hours of daylight. In the short 55 of winter, its fur becomes white. The fur becomes gray 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 birds to begin their long migration 56 twice each year. Birds 57 flying become restless when it is time for the trip, 58 they become calm again when the time of the flight has ended.

　　Scientists say they are beginning to learn which 59 of the brain contain biological clocks. An American researcher, Martin Moorhead, said a small group of cells near the front of the brain 60 to control the timing of some of our actions. These 61 tell a person when to 62 ，when to sleep and when to seek food. Scientists say there probably are other biological clock cells that control other body activities.

　　Dr. Moorhead is studying 63 our biological clocks affect the way we do our work. For example, most of us have great difficulty if we must often change to different work hours.

　　64 can take many days for a human body to accept the major change in work hours. Dr. Moorhead said industrial officials should have a better understanding of biological clocks and how they affect workers. He said 65 understanding could cut sickness and accidents at work and would help increase a factory’s production.

　　51. A scientists B humans C plants D animals

　　52. A insects B birds C fish D snakes

　　53. A effect B affect C effected D affected