单项选择题

A．By crushing large amounts of stone.
B．By causing mud or sand to mix with ocean water.
C．By creating large waves on the Surface of the ocean.
D．By greatly increasing the ocean’s depth in some areas.
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单项选择题
A．They are changing their news program.B．They are swimming in the channel.C．They are listening to the radio.D．They are watching TV.
A．They are changing their news program.
B．They are swimming in the channel.
C．They are listening to the radio.
D．They are watching TV.
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.
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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