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

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

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问题 But diets that restrict certain food groups or promise unrealistic results are difficultor unhealthyto sustain over time.
选项 A、maintain
B、reserve
C、conceive
D、empower
答案A
解析 题意：限制某些食物种类或是承诺不切实际效果的饮食很难长时间维持，或者说长时间坚持会不利于健康。sustain意思是“坚持、维持”，与maintain同义。reserve“保留”，conceive“察觉”，empower“赋权”。故本题选A。
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