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

試題分析：句意：除了適當(dāng)?shù)娘嬍�，鍛煉是健康的生活方式的一個重要的組成部分。四個選項的含義分別是：A. Components組成部分，B. Categories目錄，C. Ranges范圍，射程，D. Processes過程，所以選A。
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