给下列图片选择恰当的句子。
1. Don't turn left here.
2. China sent this present to the UN in 1974. It's a train.
3. The snake thinks the flute is another snake. So it copies the other snake.
4. Look at this postcard. There are lots of bicycles in China. People ride them to work.
5. I have got some chopsticks, but they are difficult.