Animals are obviously lower form of life than man.A. a; /B. the; theC. a; theD. /; /

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(答案→)A. a; /
B. the; the
C. a; the
D. /; /
解析：考查冠词。根据句意：很明显，动物是比人类低级的（一种生命存在方式）。man表示“人类”时前面不加冠词。a form of指“一种……的方式”表泛指。所以答案选A。