问题补充:
Smoking is one of the of heart disease and it kills lots of people every year.
A. causes
B. reasons
C. excuses
D. results
答案:
(答案→)A. causes
B. reasons
C. excuses
D. results
解析:词义辨析。A. 引起的原因 B. 理由;理性 C.接口;理由 D. 导致的结果。句意:吸烟是引起心脏病的原因之一,每年致死很多人。结合语境可知选A。