-- I met Liu Xiang on the plane to Shenzhen last Sunday. You know I'm his fan.
-- !
A:How lucky you are
B:How relaxing it is
C:What a lucky plane
D:What a wonderful day
下面的图形中有____个三角形,有____个长方形,有____个正方形,有____个圆;最多的是____形,最少的是____形,一样多的是____和____。
太阳活动强弱的标志是( )
在人类起源和发展的漫长历程中,森林古猿下地生活的原因是( )