单项选择题

The young chemist is ______ experiments in much the same way that his instructor used to do.

A．reforming
B．conducting
C．prompting
D．participating
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单项选择题
The primitive weapon ______ from that country as it could not be traced back to any other origin.
A．must be introduced
B．must have been introduced
C．might be introduced
D．might have been introduced
单项选择题
It is no good trying to ______ the consequences caused in the damage.
A．calculate
B．compute
C．maximize
D．minimize
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