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.


  1. A.
    at
  2. B.
    to
  3. C.
    by
  4. D.
    for
C

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