一种商品的替代品种类越多供应越充足,则其需求弹性越大。A.正确B.错误

一种商品的替代品种类越多供应越充足,则其需求弹性越大。A.正确B.错误

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It takes a lot of time to learn a foreign language.

It takes a lot of time to learn a foreign language.

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Either you must improve your work, or I shall dismiss you.

Either you must improve your work, or I shall dismiss you.

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