It is such an i____ performance that we will never forget it.
如图,AB为⊙O的直径,弦CD⊥AB于点E,若AE=8,BE=2,则CD=( )
如图三幅图是表示地球演变过程中海陆分布的变化情况,根据大陆漂移的假说,由早到晚的排列顺序是( )