When his mother came in, he stopped          .

自然增长率=人口出生率﹣人口死亡率。当自然增长率为0时，是人口总量从增加到减少的转折点。读图回答以下问题。

根据你的判断，将下面各个句子，填到对话的横线上，只填句子前的字母编号。

Zoom: Good afternoon, Zip!          Zip: ____

Zoom: Can I have some water?     Zip: ____

Zoom: Thank you.                          Zip: ____. Have some bread!

Zoom: ____ I like cake.            Zip: Ok! ____

Zoom: Thank you.

A: Sure. Here you are.   B: Good afternoon!   C: You're welcome.

D: No, thanks!   E: Here you are.

下列线圈中不能产生交变电流的是(  )