______each smoke about 4,195 cigarettes a year. [br] It is believed by many that

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问题 ______each smoke about 4,195 cigarettes a year. [br] 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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