(单选题)

Many Americans fail to lose weight probably because ______.

A.they always exercise alone

B.they are too busy to exercise

C.they are under great pressure

D.they don’t get enough exercise

参考答案：D

参考解析：

细节理解题。根据第一段中的“Many Americans are overweight for lack of physical activities.”可知，很多美国人肥胖的原因是缺乏运动。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