单项选择题

A．They are organized by foreign students.
B．They are open for all students.
C．They are about experience sharing.
D．They are online activities.
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单项选择题
A．The man will not go anywhere but London.B．The man will not spend his winter vacation in London.C．The man wants to see the modem capital.D．The man will not have winter vacation this year.
A．The man will not go anywhere but London.
B．The man will not spend his winter vacation in London.
C．The man wants to see the modem capital.
D．The man will not have winter vacation this year.
单项选择题
A．It is a rare phenomenon.B．It changes useless land into productive land.C．It changes cropland into desert.D．It helps farmers remove fertile topsoil.
A．It is a rare phenomenon.
B．It changes useless land into productive land.
C．It changes cropland into desert.
D．It helps farmers remove fertile topsoil.
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