下列运算正确的是( )
A:a﹣2=﹣a2
B:a+a2=a3
C:2+3=5
D:(a2)3=a6
________the movie star goes, there are lots of fans waiting to see her.
长方形有____、____.
正方形有____、____.
平行四边形有____、____.
名著赏读。