A:are disappearing
B:have been disappeared
C:have been disappearing
D:will have disappeared
小明沿着坡比为1:3的山坡向上走了600m,则他升高了( )
下列命题正确的是( )
解释下列词语
集思广益: ____
辗转反侧: ____
熠熠发光: ____