未分类题

A．Why the book talks about turbidity currents.
B．How winds can affect some ocean currents.
C．The causes of underwater earthquakes.
D．What a turbidity current is.

A.Why
B.
B．How
C.
C．The
D.
D．What

【参考答案】

D
解析：What does the professor ask the student to explain?
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