单项选择题

A．$15.
B．$50.
C．$35.
D．$20.
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单项选择题
A．More electrons will be released into space.B．Radio transmission will be disrupted.C．The weather may be affected.D．The sunspot cycle will be shortened.
A．More electrons will be released into space.
B．Radio transmission will be disrupted.
C．The weather may be affected.
D．The sunspot cycle will be shortened.
填空题
From Hellman’s remark, what is the opinion about the wisdom of older people in American society
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