(单选题)

The researchers have pointed out that ______ are at a higher risk of developing cancer if taking beta carotene.

A.pregnant women

B.children

C.teenagers

D.smokers

参考答案：D

参考解析：

细节理解题。根据文章“Hazardous to Your Health”部分的第二句“And shockingly, smokers who took beta carotene were at an increased risk of developing cancer”可知，服用β-胡萝卜素的吸烟者患癌症的风险增加。故选D。

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