动物细胞与植物细胞的结构不同,导致了它们有丝分裂的不同,这是因为植物细胞[ ]
A.有叶绿体和细胞壁
B.有细胞壁和液泡
C.有细胞壁,无中心体
D.有叶绿体和液泡
答案:C
Look! The girl ________in the classroom.
A.dances
B.dancing
C.is dancing
D.dance
As we have known from the map of the world, this is ______.
A.twice as large an island as that
B.twice as larger as that island
C.as twice as that one
D.twice as a large island as that