设U={0，1，2，3}，A={x∈U|x2+mx=0}，若CUA={1，2}，则实数m=（ ）。
-3
The hill ____ is covered with trees is called Mang Hill. [ ]
A. of which top
B. whose the top
C. whose top
D. top which
如何理解鲁迅的“国民性”思想。
