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．He went to a famous school.B．He was taught by his mother.C．He was taught by his father.D．His parents employed a good teacher to teach him.
A．He went to a famous school.
B．He was taught by his mother.
C．He was taught by his father.
D．His parents employed a good teacher to teach him.
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