题目内容
4.听第10段材料,回答第17至20题.17.Why are scientists in the United States trying to develop a new tree?
A.Because old-fashioned trees look very plain.
B.Because the air in the city is getting badly polluted.
C.Because traditional trees reach too high against the sky.
18.Why must the new tree have shallow roots?
A.To avoid affecting the underground pipes.
B.To save nutrients for branches.
C.To take in more rain water.
19.What is the most important factor that makes the new tree ideal for the city?
A.Its short branches.B.Its shallow roots.C.Its ability to resist disease.
20.What is the city life like according to Professor Smith?
A.Fantastic.B.Terrible.C.Stressful.
分析 略
解答 BACB
点评 略
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