Ann: Hi Ellie, have you thought about our project on different countries and people around the world? Any ideas so far?

Ellie: Of course. I’ve already written down some questions for the project. Let’s look up the answers online!

Ann: Sounds good. I’m free to do it now. What questions do you have?

Ellie: OK, here’s my first question. How many countries are there in the world?

Ann: Almost 200 countries.

Ellie: How many people are there in the world?

Ann: The number keeps changing. A report from 2022 shows that there are around 8 billion.

Ellie: Got it. It’s obvious that the world population is still growing.

Ann: Yes, indeed. The United Nations believes the world population will be larger than 10 billion by 2100.

Ellie: Wow. That’s huge. Where do most people live, then?

Ann: Asia is the most populous continent. Almost two-thirds of the world’s population live in Asia. Currently, the world’s three most populous countries are India, China and the USA.

Ellie: Good. Just curious: which are the most populous cities in the world?

Ann: Well, according to the latest data, the three most populous cities are Tokyo in Japan, Delhi in India, and Shanghai in China.

Ellie: Noted. Let’s make sure to include the correct information in our project.

答案：2 (1) a (2) b (3) c (4) a

3 The current number might be out of date soon.