单项选择题

A．She hadn’t heard about it.
B．She’s not enthusiastic about it.
C．She’s curious to know how it works.
D．She hopes it has more than 500 channels.
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单项选择题
A．Scientists thought there wasn’t.B．Scientists hadn’t got an answer.C．Scientists were uncertain.D．Scientists were still studying.
A．Scientists thought there wasn’t.
B．Scientists hadn’t got an answer.
C．Scientists were uncertain.
D．Scientists were still studying.
单项选择题
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.
D．The strong force.
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