fruit and vegetables是单数还是复数

　　We buy our fruit and vegetables at the market.

　　我们在市场上购买水果和蔬菜。

　　Fruit and vegetables grew in abundance on the island.

　　该岛盛产水果和蔬菜。

　　Eat plenty of fresh fruit and vegetables.

　　多吃新鲜水果和蔬菜。