A：n3(2n+3)
B：2n3(2n+3)
C：n−13(2n+1)
D：n2n+1
和谐的师生关系可以让我们的学习生活充满欢乐。但师生交往的过程中有时也会产生一些隔阂。这些隔阂产生的原因有（ ）
读一读，选一选
____ Is your father here today? A. No, I don't.
____ What does your mother do? B. He's a businessman.
____ Do you want to be a head teacher? C. No. He's in Australia.
____ What does he do? D. She's a head teacher.
要把32盆花搬去布置教室，现在由8名学生来搬，平均每人搬几盆?
经度共有____ 度；东经180°和西经180°同在一条经线上，那就是180°经线。
