Mark Twain is mentioned in the passage in order to show that The ultimate purpose of Dr. Vink’s research is to

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问题 Mark Twain is mentioned in the passage in order to show that
The ultimate purpose of Dr. Vink’s research is to

选项 A、identify all the genes that are responsible for smoking.
B、determine the real cause of nicotine dependence.
C、make a difference between social smokers and other smokers.
D、help different smokers give up smoking more effectively.

答案D

解析 目的细节题。题目问的是"Vink博士研究的最终目的是什么",第五段中虽然提到了四个选项中的内容,但是末尾的一个才是最终目的。注意提示词"thus"出现时,重点往往在它的后面。
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