单项选择题

A．What a turbidity current is.
B．The causes of underwater earthquakes.
C．How winds can affect some ocean currents.
D．Why the book talks about turbidity currents.
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单项选择题
A．It has just begun snowing.B．She doesn’t like snowy days.C．It has been snowing for some time.D．She doesn’t think it’s going to snow.
A．It has just begun snowing.
B．She doesn’t like snowy days.
C．It has been snowing for some time.
D．She doesn’t think it’s going to snow.
单项选择题
A．The strength of ocean currents.B．The movement of sediment deep in the ocean.C．A new way of measuring the depth of the ocean.D．The best methods for studying deep ocean processes.
A．The strength of ocean currents.
B．The movement of sediment deep in the ocean.
C．A new way of measuring the depth of the ocean.
D．The best methods for studying deep ocean processes.
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