根据汉语提示选择句子。

1. 自然公园里有一片森林。[ ]

A. There is a forest in the nature park.

B. There is a river in the nature park.

C. There is a lake in the nature park.

2. 城市里有一个自然公园。[ ]

A. There is a city in the nature park.

B. There is a nature park in the city.

C. There is a forest in the city.

3. 公园里有小路吗？ [ ]

A. Is there a path in the city?

B. Is there a path in the park?

C. Is there a river in the park?

关于通过肺泡-毛细血管界面的气体交换量的叙述正确的是（）

A.与界面的厚度无关

B.与界面的面积成反比

C.与界面的厚度成正比

D.与界面大小无关

E.与界面的面积成正比，与界面的厚度成反比