皮皮学，免费搜题
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【单选题】
“我想买块地，自己种菜种粮食”。在食品安全事件频发的当下，一些网友发出这样的呼声。人们自种自食的农产品①不是商品，因为它没有用于交换；②是商品，因为它耗费了人类的劳动；③不是商品，因为它只有使用价值；④是商品，因为它能满足人们的需要（）A.
①②
B.
③④
C.
①③
D.
②④
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