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。
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A Biological Clock
o% I8 Y: ~. a4 q: M 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.
$ N# e3 p+ W5 |- u3 \9 e 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. 1 \0 A# l% T( P' h4 R, ~
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.
5 O# q2 G, u b( w0 `$ M/ W 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. % {/ I. O5 }5 t& W! L' N" h
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.
4 r, W8 ^. {! j: S 1. A scientists B humans C plants D animals : O+ X7 c0 n, Y: U0 C- E
2. A insects B birds C fish D snakes 来自www.Examw.com
( [' y- g; n( _$ P" h 3. A effect B affect C effected D affected 0 O# S. c0 s9 X( a
4. A because B for the reason that C because of D since
$ Q' A( u, Z$ g" T0 p4 v6 z 5. A months B days C minutes D weeks $ F- V; O3 P# _& p+ Z
6. A flight B fly C movement D transportation & m7 I! Y# v" j# I; O* F& R: M+ m
7. A prevented from B ordered by C helped by D intruded on
) d. c8 V- f% O; e- ]+ |% m7 w 8. A and B but C therefore D however
- z% E7 j1 F" J4 W& J9 t6 O9 y 9. A portions B parts C sections D kinds
$ C: g# y' {/ A, v* r0 } 10. A try B tries C seem D seems
+ p7 D. K& z4 { 11. A things B parts C cells D actions $ R0 K, E8 f X
12. A awaken B wake C awakening D wake-up
* E" a# S* G3 n# U* [ 13. A how B why C where D what
9 ?7 n9 V; H2 ~# @" Y$ ]! F 14. A We B It C They D You
5 m, J/ W! J' ]3 ~8 D6 D& e 15. A so B with C such D if
1 T( A |+ U' ` 答案:CABCB AABBD CAABC |