眼力大比拼

請根据提示，猜猜这4张图都是什么？

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.