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【单选题】
斯密认为，使用价值很大的东西，可能具有极小的交换价值，甚至没有；反之，交换价值很大的东西，往往具有极小的使用价值，甚至没有。由此可见，斯密（）。 ①科学地提示了商品的交换价值不是由使用价值决定的 ②认为商品使用价值和交换价值之间是对立统一的关系 ③未能认识到没有使用价值的东西不可能具有交换价值 ④不懂得商品的交换价值是使用价值形成的前提和基础A.
②④
B.
①③
C.
①②
D.
③④
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A.
正确
B.
错误
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A.
X，Y互不相关
B.
X，Y相互独立
C.
Var(X)=0
D.
Var(Y)=0
E.
Var(X)Var(Y)=0
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A.
while
B.
therefore
C.
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D.
so that
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