职称英语卫生类b级|2017年职称英语卫生类C级阅读复习讲义(7)

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 open. It tells __(2)__ 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 __(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 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 __(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 work. For example, most of us have great difficulty if we must often change to different work hours.

　　__(14)__ 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 __(15)__ understanding could cut sickness and accidents at work and would help increase a factory's production.

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

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

　　3. A) effectB) 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) woke　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

2017年职称英语卫生类C级阅读复习讲义(7).doc

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