Official 32 Lec 3
答题结果:0/6
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Question 5 of 6
What factors led to the disappearance of trees in the Copper Basin?

A.

Mines were dug under areas where trees were growing.

B.

Loose soil led to trees being washed into the rivers.

C.

Trees growing near the mines were cut and used as fuel.

D.

Clouds of sulfuric smoke killed trees in the area.

我的答案:

正确答案:CD

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