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Besides proper diet, exercise is one of the key ___________of a healthy lifestyle.
A.componentsB.categoriesC.rangesD.processes
A

试题分析:句意:除了适当的饮食,锻炼是健康的生活方式的一个重要的组成部分。四个选项的含义分别是:A. Components组成部分,B. Categories目录,C. Ranges范围,射程,D. Processes过程,所以选A。
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