Most experts agree that washing hands regularly is a ______way to prevent the spread of many diseases.
A．powerfulB．illegalC．painfulD．a(chǎn)wful
A

試題分析：A. powerful強大的；權(quán)力大的；（藥）有效的，B. illegal非法的，C. painful痛苦的， D. awful糟糕的，可怕的，非常的，極大的，句意：大多數(shù)專家同意經(jīng)常洗手是一個有效防止很多疾病的方式。根據(jù)句意選A。
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