单项选择题

If a star seems to be moving in a wavy line, we（）it of being a double star.

A．doubt
B．believe
C．guess
D．suspect

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单项选择题
When it started to snow, we turned round and（）the hotel.

A．got by
B．searched for
C．made for
D．cleared up
单项选择题
More has been learned about the Moon than any other of the Earth''s neighbors in space because of the Apollo program, which enabled men to walk on the Moon and bring back hundreds of pounds of（）.

A．rocks
B．rock
C．stone
D．stones
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