单项选择题

A．Employ them as lab assistants.
B．Teach chemistry classes at their high school.
C．Help them with their studies.
D．Pay them for participating in the study.
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单项选择题
A．Their son will be a little bit influenced.B．Their son will not take the examination owing to the weather.C．The weather will affect their son severely.D．The weather will not make any difference to their son.
A．Their son will be a little bit influenced.
B．Their son will not take the examination owing to the weather.
C．The weather will affect their son severely.
D．The weather will not make any difference to their son.
单项选择题
The lakes are kept constantly full by the rains and by the melting of the snows.
A．Y
B．N
C．NG
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