I live in a noisy neighborhood.It's difficult ____.
A:slept
B:sleeping
C:sleep
D:to sleep
与480×40的积一样的算式是( )
如图,将矩形ABCD绕点A顺时针旋转90o后,得到矩形AB’C’D’,若CD=8,AD=6,连接CC’,那么CC’的长是( )