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I have a good friend. ①他叫汤姆。He is a nice boy, but he eats too much and he doesn’t like sports.
He has a big breakfast every morning. He has four eggs, some bread and milk. For lunch, he eats two hamburgers, ② lots of French fries and chicken. He has much cola, too. For dinner, he likes beef(牛肉) and salad. He likes ice cream, cola, hamburgers and dessert.
③ Too much food is not good for him. And he is not healthy.
的相反数是（ ）
分子式为C5H10O2的酯共有（不考虑立体异构）