题干
______ in her most beautiful skirt, the girl tried to make herself ______ at the party．
A：Dressed; noticing
B：Dressing; noticed
C：Dressed; noticed
D：Dressing; being noticing
答案(点此获取答案解析）
C
，
，则集合
等于 ( ▲ ) ．
为定义在R上的奇函数，当
时，
（b为常数），则
=