【年职称英语理工类B级模拟训练（05）】 职称英语B.doc

最新【2017年职称英语理工类B级模拟训练（05）】 职称英语B职称英语网权威发布2017年职称英语理工类B级模拟训练（05），更多2017年职称英语理工类B级模拟训练（05）相关信息请访问职称英语考试网。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。 A Biological Clock Every living thing has what scientists call a biological clock that controls behavior. The biological clock tells _1_ when to form flowers and when the flowers should open1. It tells _2_ when to leave the protective cocoon and fly away, and it tells animals and human beings when to eat, sleep and wake. Events outside the plant and animal _3_ the actions of some biological clocks. Scientists recently found, for example, that a tiny animal changes the color of its fur _4_ the number of hours of daylight. In the short _5_ of winter, its fur becomes white. The fur becomes gray brown in color in the longer hours of daylight 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 _6_ twice each year. Birds _7_ flying become restless when it is time for the trip, _8_ they become calm again when the time of the flight has ended. Scientists say they are beginning to learn which _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 when to _12_, 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 _13_ our biological clocks affect the way we do our work2. For example, most of us have great difficulty if we must often change to different work hours. _14_ can take3 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 _15_ understanding could cut sickness and accidents at work and would help increase a factorys production. 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 because of 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 by D 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 awakening 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 答案：CABCB AABBD CAABC推荐访问:2017年职称英语理工类B级模拟训练（05）2017年职称英语考试2017年职称英语取消 第 3 页 共 3 页