题干
—Are you different your friend, Mary ?
—No, we are similar each other! We like to do the same things.
A：to ; from
B：from ; to
C：to ; to
D：from ; from
答案(点此获取答案解析）
B
的定义域为R，且满足：
是奇函数，若
=9，则
等于( )
