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.
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单项选择题
A．She likes sports.B．She is used to outdoor activity.C．She likes taking pictures now.D．She is adapted to the life in the mountains.
A．She likes sports.
B．She is used to outdoor activity.
C．She likes taking pictures now.
D．She is adapted to the life in the mountains.
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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