I hate people _______ laugh at others when they are in trouble.
A: who
B: whom
C: which
D:they
小文房间的面积为10.8m2,房间地面恰巧由120块相同的正方形地砖铺成,每块地砖的边长是多少?
若(2x-1x)5=a0+a1x+a2x2+···+a5x5,则a3的值为( )