19. The old scientist took up walking as a regular form of exercise, which, of course, is of great   to his heath.

A. benefit       B. favour

C. sense         D. relationship

19. A考査名詞辨析。benefit此處用作抽象名詞，意思是"益處，好處"；be of benefit to…對 有好處。句意：這位老科學家以步行作為一項經(jīng)常性的鍛煉方式，當然，這對他的健康有很大的好處。故A正確。

題目來源：2015全品語法快練高中英語新課標 > 訓練4數(shù)詞、冠詞、代詞、名詞

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A

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