A salty diet may increase the risk of stomach cancer ________ 10 percent, South Korean researchers found in a study of more than 2 million people.

A.a(chǎn)tB.toC.byD.for

C

解析這題考查介詞的用法:increase by“增加了”,句意是:鹽份多的食物會增加胃癌的幾率10%。選C。

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