单项选择题

A．Do much research in many fields of science.
B．Understand people in other countries better.
C．Both A and B
D．Neither A nor B
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单项选择题
A．The moon.B．Other planets.C．Both A and BD．Neither A nor B
A．The moon.
B．Other planets.
C．Both A and B
D．Neither A nor B
单项选择题
A．It is the smallest one of all the stars,B．It is the nearest one to the earth.C．It is the biggest one of all the stars.D．It is the farthest one from the earth.
A．It is the smallest one of all the stars,
B．It is the nearest one to the earth.
C．It is the biggest one of all the stars.
D．It is the farthest one from the earth.
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