根据短文判断对错。

Sam has got many postcards from his friends. Look at this one. It's a picture of the Great Wall. It's very long. It's more twenty thousand kilometres long. Many people like to climb it. It's in Beijing, the capital of China. Beijing is very big and famous. Beijing has got about twenty million people. There are lots of big shops and restaurants. You can eat delicious food. Sam likes his collections very much.