单项选择题

There is only, ______, random monitoring of gas emission by the pollution control agency.

A．at best
B．with the best
C．for better
D．on the better
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单项选择题
He is asked to make further improvements on the products ______ the light of the feedback of the customers.
A．in
B．at
C．on
D．with
单项选择题
Alan is ______ than Peter.
A．more skilled a technician
B．a more skilled technician
C．more a skilled technician
D．more skilled technician
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