Fruit and vegetables are good for your health,but fast food,

选 A is
对应主语是fast food. 单数


Fruit and vegetables are good for your health,but fast food,like potato chips is not.
水果和蔬菜是对你健康有益的, 但速食食品却不是, 像薯条.



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再问： “说的是薯片这一种东西所以要用单数is.” 对吗？？？？？？？
再答： 不对! is是对应 fast food 的, 不是 potato chips. 其实句子应该是这样的 Fruit and vegetables are good for your health，but fast food is not, like potato chips.