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共94小题，约2860字。

　　Unit 4  Astronomy: The science of the stars
　　单元练习题
　　一．知识回顾
　　I.重点词汇及短语
　　1.太阳系_____________________        2.及时；终于___________________       
　　3.下蛋 ______________________        4.产生；分娩____________________
　　5.轮到某人；接着_______________      6.阻止；制止 ___________________      
　　7..挡住（光线）___________________    8.感到高兴；感到振奋 _____________    
　　9.既然  _______________________       10.突发；爆发  __________________
　　11.密切注视；当心；提防 ____________  12.开始存在；产生________________   
　　13.当着某人的面_____________________  14.对……有害_____________________
　　II.词汇运用
　　1. presence
　　①He apologized to her _________________ the whole family. （当着家人的面）
　　②All the people ___________ at the party were his supporters.
　　A. present   B. thankful     C. interested       D. important
　　③The Grammy Awards _____________every year in the music industry in the United States.(授予; 给予)
　　④Please allow me to _______Mr. Brown _______you.(介绍，引见)
　　⑤出席________________        提出自己的观点_____________________
　　2. harmful
　　①Don’t read  in the sun, for it’s _______________________________(对你的眼睛有害)
　　②对某人有害___________________________________________
　　3. exist
　　①.做这种手术的技术早已存在
　　__________________________________________________________________________
　　②. When did the world ______ ______ ______________？(开始形成)
　　4. in time
　　①If you catch the early bus, you will get there_______________(及时)
　　②Keep on working, and you will succeed __________________(终究)
　　5. prevent …from ;  stop /keep…from
　　①Something must be done to ________the environment___________________(防止污染).
　　②She ___________ her eyes_______(保护)the sun with her hands.
　　③You should prevent your son _______ too many computer games
　　A to play      B playing      C play     D from play
　　6.cheer up 
　　①____________a bit, things aren’t that bad.
　　②The crowd ________the runners _________(为……加油鼓励)when they started the last lap.
　　7.breat
　　①介、副词填空(1)She started to speak, then broke ______ while a waitress served us with coffee.
　　(2)He lost his job and his marriage broke ______.
　　(3)Her health broke ________ under the pressure of work.
　　(4)Should another world war break ______， what would become of human beings?(5)Firemen had to break the door ______ to reach the people trapped inside.(6)The meeting broke ______ at eleven o'clock.
　　②----Do you know when the Anti-Japanese War________?
　　-----Of course. As a Chinese, I’ll never forget that day: July7,1937.
　　A brot   B brop   C broke in     D broke off
　　③If Mike carries on working like this, he’ll ______sooner or later.
　　A put down   B get down   C break down     D go down
　　⒏ now that 
　　①既然你恢复健康了，你可以继续你的工作了。
　　__________________________________________________________________________
　　②____________you’ve got a chance, you might as well mall use of it
　　A. now that    B. after     C Although   D As soon as
　　⒐ in one’s turn