點(diǎn)擊進(jìn)入：2014職稱(chēng)英語(yǔ)理工類(lèi)沖刺練習(xí)匯總2　

　A Biological Clock

　　Every living thing has what scientists call a biological clock that controls behavior. The biological clock tells 51 when to form flowers and when the flowers should open1. 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 the 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 work2. For example, most of us have great difficulty if we must often change to different work hours.

　　64 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 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

　　54. A because B for the reason that C because of D since

　　55. A months B days C minutes D weeks

　　56. A flight B fly C movement D transportation

　　57. A prevented from B ordered by C helped by D intruded on

　　58. A and B but C therefore D however

　　59. A portions B parts C sections D kinds

　　60. A try B tries C seem D seems

　　61. A things B parts C cells D actions

　　62. A awaken B woke C awakening D wake-up

　　63. A how B why C where D what

　　64. A We B It C They D You

　　65. A so B with C such D if

　　答案：CABCB AABBD CAABC

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