近年来发现北极地区冰川消融速度加剧，与此现象相关的环境问题可能是（ ）

下列是生殖发育有关的示意图，请分析作答：

A: Tom, ____?

B: Well, I get up at 5:30. So I never(从不) go to school late.

A: Do you have breakfast at home?

B: Yes, ____. 

A: And when do you go to school?

B: Class begins at 8:00, so ____ at 7:30.

A: ____?

B: No, I have lunch at home.

A: ____?

B: I usually get home at 5:15.