题目内容
7.听第10段材料,回答第17至20题.17.What we scientists worried about in the 20th century?
A.Polluting the earth's water and air
B.Cutting down trees
C.Pouring dangerous chemicals
18.What would become rare by the year 2300?
A.Water B.Food C.Fish
19.Why should we leave the earth by the year 2400?
A.There would be no air.
B.The air was heavily polluted
C.We would not breathe.
20.What is the speaker talking about?
A.Saying the earth B.Leaving the earth C.Changing lifestyle.
分析 略
解答 ABBC
点评 略
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