There are _______ things in your room. Stop buying anything until you can clean up your room.
A:so many
B:less
C:too much
D:so much
造成一天中气温变化的最主要的原因是( )
解分式方程: 1x−2 = x−1x−2−3 .
如图是切开的苹果,从结构上可以判断这种植物属于( )