請根據(jù)提示，猜猜這4張圖都是什么？

1. It becomes bigger and bigger when you blow air into it.

2. It is the meat from cattle（牛）. We can use it to cook steak（牛排）. It is delicious.

3. It is a kind of clothing. It’s very warm.

4. It is a kind of vegetable. It’s purple on the outside. But it’s green on the inside.