题干
—What did Tina say?
—Sorry, I didn't ________ what she said.
—Sorry, I didn't ________ what she said.
A：pay attention to
B：get on with
C：look forward to
D：deal with
答案(点此获取答案解析）
A
在定义域R内可导，若
，若
则
的大小关系是（ ）