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.
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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.
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.
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