(单选题)

According to the passage, the incidence of cancer is generally believed ______.

A.to be based on inactive life style

B.to be due to anxiety

C.to result from environmental influences

D.to be caused by heavy smoking

参考答案：C

参考解析：

细节理解题。根据题干“the incidence of cancer”可定位到第二段第二句“These data indicate there may be special and specific environmental influences, largely based on personal life-style, that determine the incidence of various forms of cancer in different communities — but that is all the data suggest”可知癌症的发病率主要由环境影响所导致的。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