2. 外语
  3. ______each smoke about 4,195 cigarettes a year. It is believed by many that the cancers of the lungs and throat are caused ____

______each smoke about 4,195 cigarettes a year. It is believed by many that the cancers of the lungs and throat are caused ____

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问题 ______each smoke about 4,195 cigarettes a year.
It is believed by many that the cancers of the lungs and throat are caused ______ by smoking.
选项 A、mainly
B、partly
C、in some way
D、in no way
答案A
解析 细节题。题干问：“很多人认为肺癌和喉癌与吸烟的关系是什么?”文章第三段的第一句话说“这个领域内大多数的研究人员认为吸烟是产生肺和咽喉癌变的非常重要的因素……”所以答案选A，即“主要由吸烟引起的”。
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