我国现阶段出现的许多社会问题、经济发展问题等都是人口太多所带来的不利影响，因此，应该大力减少我国的人口，越少越好，你认为这种说法全面吗？谈谈你的认识。

A: Good morning， Zhou Jun. ____

B: I usually come to school on foot.

A: ____

B: Six. I have four classes in the morning and two classes in the afternoon.

A: ____

B: My favorite sport is basketball.

A: ____

B: Because it's very exciting(令人兴奋的).

A: ____

B: Mr. Zhao. Look! He is playing basketball there.

A: Nice talking to you. Thank you.

《贝多芬》在立意和构思上扣住什么主题选材？