问题补充：
I think running is an easy way to keep healthy.
----, but Bill doesn’t think so.
A. No problem
B. I hope not
C. I agree
D. I’m afraid not.
答案：
A. No problem
B. I hope not
(答案→)C. I agree
D. I’m afraid not.
解析：情景交际. No problem没问题;I hope not 我希望不;I agree我同意;I’m afraid not.恐怕不是.句意:我认为跑步是保持健康的一个好方法.联系下文,但是比尔不这样认为.可知选C最符合语境.
