单项选择题

It was from the Lowell Laboratory that the ninth（）, Pluto, was sighted in 1930.

A．planet
B．constellation
C．stardom
D．satellite

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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
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
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