--- It’s a fine day today. Why not go out for a walk?
---- .
A. Good luck
B. That’s OK
C. It’s very kind of you
D. Good idea
网友回答
A. Good luck
B. That’s OK
C. It’s very kind of you
(答案→)D. Good idea
解析：考查交际用语。Good luck 祝你好运；That’s OK没关系，不用谢；It’s very kind of you你太好了；Good idea好主意。句意：天气太好了。为什么不出去散步呢？好主意。所以选D。