根据对话内容，判断正误。

Peter: What's your favourite fruit, Betty?

Betty: Apples. Because they are sweet.

Peter: I like fruit. But I don't like grapes. They are sour（酸的）. I like oranges. They are yummy.

Bill: I like potatoes. They are delicious. What about you, Ann?

Ann: I don't like potatoes. But I like fish. It's fresh.

Ben: I like fish, too. It's very healthy.