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题目内容
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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.
参考答案
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。
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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已知某国国际收支平衡表中，经常项目差额160亿美元，资本和金融项目差额为-100亿美元，误差与遗漏为1o亿美元，则该国储备资产增减额为（ ）。A.70亿元
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