(单选题)
According to the article, how important is the genetic factor in causing cancer?
A.It is the most important factor by far.
B.It is actually quite insignificant.
C.It is one of many contributing factors.
D.Its importance varies according to gender.
参考答案：C
参考解析：
细节理解题。根据文章第二段第一句“While there is plenty of evidence that genetic propensity plays a significant role in determining whether a person will get cancer”可知，遗传倾向在决定一个人是否会得癌症方面起着重要作用，但没说是最重要的因素，因此A项错误，B项错误，C项正确，D项（其重要性因性别而异）未涉及。故选C。
知识点：阅读理解四选一 英语专业基础知识 阅读理解 教师招聘-小学 英语
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