Based on recent studies made by various scholars， which of the following factors plays a fundamental role in man‘s longevity? 查看材料
A.Genes.
B.Eating habits.
C.Environment.
D.Medical condition.

A.Genes.
B.Eating
B.
C.Environment.
D.Medical
C.

【参考答案】

A
解析：第二段第一句“Thereasonbehindthesteadyriseinlifeexpectancy......

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