Smoking is one of the ______ of heart disease and it kills lots of people every year.
A．causesB．reasons C．excuses D．results
A
詞義辨析。A. 引起的原因 B. 理由；理性  C.接口；理由 D. 導(dǎo)致的結(jié)果。句意：吸煙是引起心臟病的原因之一，每年致死很多人。結(jié)合語(yǔ)境可知選A。
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