单项选择题

High production rates are often achieved at the ______ of quality of work.

A．expense
B．exposure
C．expansion
D．expectation
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单项选择题
Most approaches to self-improvement, like keeping fit, involve some form of ______ tasting medicine or unpleasant diet.
A．massive
B．horrible
C．nasty
D．hasty
单项选择题
Before a child can learn a musical instrument he or she first needs to acquire the necessary ______ skills.
A．perceptive
B．operative
C．jeopardous
D．manipulative
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