Ⅰ.用所給單詞的適當形式填空

　　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 __________________________ (對……有很大危害) the environment in the past ten years. (harm)

　　2.Hearing that some measures had been taken in time __________________________ (阻止污染的進一步惡化), they all cheered up. (prevent)

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

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

　　5.When the war ____________________ (爆發(fā)), 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

　　.話題寫作

　　根據(jù)提示，利用本單元所學知識，完成下面的小作文。

　　1.火星上有生命嗎?不知道。我們能登陸火星嗎?這完全取決于科學技術(shù)的發(fā)展。

　　2.火星上沒有氧氣，中午的溫度可能在50度左右，而晚上則在零下100度左右。這樣我們就不能在那里生活。

　　3.既然火星與地球完全不同，如果我們計劃有朝一日去火星的話，我們就要帶上氧氣、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.