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单项选择题
Which one of the following molecules is found only in certain cells and in certain plants?
A、Plant metabolites
B、Primary metabolites
C、Secondary metabolites
D、All of the above
B、Primary metabolites
C、Secondary metabolites
D、All of the above
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问答题
Dogs need food and water to survive.
答案：
是的，狗需要食物和水来生存。食物为狗提供必要的营养，包括蛋白质、脂肪、碳水化合物、维生素和矿物质，这些都是它们生长、维持...
