单项选择题

It pays ____________ to buy goods of high quality.

A．at the end
B．in conclusion
C．at length
D．in the long run
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单项选择题
Although he failed in the English examination, it was wrong to ____________ with his efforts.
A．laugh
B．mock
C．sneer
D．trifle
单项选择题
The heating system in the hotel is very advanced, and its temperature can be controlled ____________.
A．automatically
B．artificially
C．manually
D．economically
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