单项选择题

A．The meeting is going on in Room 241.
B．The meeting is canceled.
C．The meeting is about space technology.
D．The meeting is held in the conference room.
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单项选择题
A．individualB．friendC．colleagueD．person
A．individual
B．friend
C．colleague
D．person
单项选择题
In the last line of paragraph 2, find a needle in a haystack implies ______.
A．the importance of the case
B．the responsibility of the police
C．the difficulty of the problem
D．the seriousness of the problem
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