单选题AThe causes are obvious.BThe causes are very complicated.CThe causes are familiar.DThe causes are not well understood.

单选题
A

The causes are obvious.

B

The causes are very complicated.

C

The causes are familiar.

D

The causes are not well understood.


参考解析

解析:
推断题。从录音开头部分“their cause and control remain a serious problem that is difficult to solve”可推断,由于原因复杂,所以难以解决。故选B。

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