题干
（浙江卷18）. -- According to my grandma, it is a good idea to eat chicken soup when you have a cold.
-- __ , scientists agree with her.
A：Sooner or later
B： Once in a while
C：To be exact
D：Believe it or not
答案(点此获取答案解析）
D
的展开式中
的系数是（ ）