题目内容

Smoking is one of the ________causes of cancer，killing millions of people each year.
A．majorB．similarC．commercialD．chemical
A
本题考查形容词辨析。Major主要的；similar相似的； commercial商业的；chemical化学的。句意：吸烟是引发癌症最主要的原因之一，每年致死数百万的人。故选A。
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