2012职称英语理工类B级考前冲刺题08

会计考友

　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.
' \. {$ M" k/ A& s( M7 W　　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.
* l: @0 [9 s. ]9 ]1 s　　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.
+ X1 Q; e3 d* k　　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.
" F) R: c% W" R+ u1 G　　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 factory's production.
7 Q7 n4 u0 P: D# B　　1. A scientists B humans C plants D animals
. p% Y; b# p  n　　2. A insects B birds C fish D snakes
5 m0 A: m% a! y1 p; o4 n　　3. A effect B affect C effected D affected中 华 考 试 网
　　4. A because B for the reason that C because of D since
　　5. A months B days C minutes D weeks
# V, V9 b5 ]3 d　　6. A flight B fly C movement D transportation
9 `/ l  U  W: n- j1 D3 s9 _7 o　　7. A prevented from B ordered by C helped by D intruded on
# C" c8 a) Y* ?/ q5 P) c0 A' W　　8. A and B but C therefore D however
& {" U  P! _, W+ K2 U& N　　9. A portions B parts C sections D kinds
　　10. A try B tries C seem D seems外语学习网
　　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
) i  P1 V% k& B- f% e! p  i　　答案：CABCB AABBD CAABC