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Mike：Hi, I’m Mike. I’m from the United States.
Boy：Welcome to our class, Mike. We’re happy to meet you.
Mike：Can you tell me a bit more about China?
Girl：Sure! Did you know that China is one of the oldest countries in the world? It’s over 5,000 years old.
Mike：Yes, I did. It’s much older than my country— in fact, the United States is one of the youngest countries in the world. It’s not even 300 years old.
Boy：And China has the biggest population, too. It’s a lot bigger than the population of the United States.
