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　　64. Doctors generally agree that such factors as cigarette smoking, eating rich foods high in fats, and alcohol consumption not only do damage by themselves but also aggravate genetic predispositions toward certain diseases.

　　(A) not only do damage by themselves but also aggravate

　　(B) do damage by themselves but also are aggravating to

　　(C) are damaging by themselves but also are aggravating

　　(D) not only do damage by themselves, they are also aggravating to

　　(E) are doing damage by themselves, and they are also aggravating

　　答案解析如下：

　　(A)not only do damage by themselves but also aggravate

　　【正确】 “not only do damage……but also aggravate”正确使用了“not only X but also Y”的平行结构。

　　【大意】 医生们一般同意吸烟，摄取高脂肪食物和酗酒不仅本身会造成损害，还会将遗传素质导向某些疾病。

　　(B)do damage by themselves but also are aggravating to

　　【错误】 见(A)。

　　(C)are damaging by themselves but also are aggravating

　　【错误】 见(A)。

　　(D)not only do damage by themselves, they are also aggravating to

　　【错误】 见(A)。

　　(E)are doing damage by themselves, and they are also aggravating

　　【错误】 见(A)。

　　【最优解题思路推荐】

　　有日常逻辑可知“do damage”和“aggravate”是递进关系，仅有(A)正确使用了“not only X but (also) Y”的平行结构，因此选择(A)。

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(编辑：马荟)