单项选择题

A．Their surface features.
B．Their chemical composition.
C．Their temperature.
D．Their age.
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单项选择题
A．Because be can improve his language ability.B．Because he can have a good time singing.C．Because the woman says it is exciting.D．Because he has to meet his professor there.
A．Because be can improve his language ability.
B．Because he can have a good time singing.
C．Because the woman says it is exciting.
D．Because he has to meet his professor there.
单项选择题
A．Adult children should visit their parents from time to time.B．Parents should support their adult children when they are in trouble.C．Children should leave their parents when they are grown up.D．Parents and children should share the family expenses when living together.
A．Adult children should visit their parents from time to time.
B．Parents should support their adult children when they are in trouble.
C．Children should leave their parents when they are grown up.
D．Parents and children should share the family expenses when living together.
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