1. 阅读选择

A: What are you doing?

B:

A: Great! Can you tell me something about the book?

B: Certainly! It says 1,000 years ago, the world's population was very small.

A: Really?

B: Yes, but during the last three or four hundred years, the world's population has grown very quickly. Today, it is growing faster than ever before.

A: Sorry, I don't know.

B: It's more than 7. 2 billion.

A: It's so large.

B: Yes. If we don't control the population, there will be not enough space even to stand for people on Earth in 600 years.

A:
 

A. Do you know what the world's population today is? B. I'm reading a book about the world's population. C. What's the population? D. It's too terrible. E. It was less than 0. 3 billion. F. I think we must do something to control the population.