第一部分　必修三　Unit 4

　　Ⅰ.用所给单词的适当形式填空

　　1．A ________(violence) tornado hit a village in China the other day.

　　2．As we all know, a bad eating habit is ________(harm) to one's health.

　　3．Do you believe the ________(exist) of ghost?

　　4．There is a ________ expression on his face because of the ________ problem. (puzzle)

　　5．To me the whole ________(global) is like a family.

　　答案：1.violent　2.harmful　3.existence　4.puzzled; puzzling　5.globe

　　.完成句子

　　1．Some of them __________________________ (对……有很大危害) the environment in the past ten years. (harm)

　　2．Hearing that some measures had been taken in time __________________________ (阻止污染的进一步恶化), they all cheered up. (prevent)

　　3．__________________________ (有可能) these plants will be moved next year. (chance)

　　4．The new bridge is ________________________ (三倍宽) that one built last year. (width)

　　5．When the war ____________________ (爆发), the two countries broke off their diplomatic relations. (break)

　　答案：1.have done/caused great damage to

　　2．to prevent pollution from worsening

　　3．Chances are that

　　4．three times the width of

　　5．broke out

　　.话题写作

　　根据提示，利用本单元所学知识，完成下面的小作文。

　　1．火星上有生命吗？不知道。我们能登陆火星吗？这完全取决于科学技术的发展。

　　2．火星上没有氧气，中午的温度可能在50度左右，而晚上则在零下100度左右。这样我们就不能在那里生活。

　　3．既然火星与地球完全不同，如果我们计划有朝一日去火星的话，我们就要带上氧气、食物、衣服和住的地方。

　　答案：Is

　　there

　　life

　　On

　　Mars?

　　We

　　don't know.Can we land on Mars?

　　It all depends on

　　the development of science and technology.Man

　　has

　　known

　　a

　　little

　　about Mars.There is almost no oxygen on Mars. It might

　　be about

　　50

　　degrees above zero

　　at noon and

　　100

　　degrees

　　below zero

　　at

　　night，which

　　prevents

　　us

　　from

　　living

　　there. Now that Mars is quite different from our earth, if we are to go to Mars one day，we should have to

　　take

　　along

　　our own oxygen，food, clothing and shelter.

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