单项选择题

But diets that restrict certain food groups or promise unrealistic results are difficultor unhealthyto sustain over time.

A．maintain
B．reserve
C．conceive
D．empower
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单项选择题
We demand sometangibleproof of our hard work in the form of statistical data, a product or a financial reward.
A．intelligible
B．infinitive
C．substantial
D．deficient
单项选择题
Throughout most of the recorded history, medicine wasanything butscientific.
A．more or less
B．by and large
C．more often than not
D．by no means
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