单项选择题

To test his theory, the chemist ______ an experiment.

A．set up
B．set out
C．set forth
D．set in
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单项选择题
The difference is so small as to be ______.
A．neglectful
B．neglecting
C．negligent
D．negligible
单项选择题
The two copper mining companies will be merged soon so as to become more competitive at the world market.
A．combined
B．relayed
C．reproached
D．bankrupted
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