单项选择题

The laboratory technician often warns the trainees that they can't be（）careful in doing the experiment.

A．much
B．so
C．most
D．too

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The chairman（）a question for discussion.

A．aroused
B．raised
C．arose
D．rose
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No one is interested in that,（）

A．is one
B．are they
C．is he
D．isn't he
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