填空题

S8

【参考答案】

double→doubled

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单项选择题

A．When he was seventeen.B．Shortly before he died.C．When he was thirty.D．Two weeks before he died.

A．When he was seventeen.
B．Shortly before he died.
C．When he was thirty.
D．Two weeks before he died.

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A．The gravitational force.B．The electromagnetic force.C．The weak force.D．The strong force.

A．The gravitational force.
B．The electromagnetic force.
C．The weak force.
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