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问题 名词解释

边际替代率

答案

参考答案：

指如果消费者在收到额外一单位商品X之后要保持满足水平不变而必须放弃的商品Y的数量。

选择题

—__________?

—Yes. I want some apples.

A．What do you want

B．Can you help me

C．Can I help you

D．Do you like apples
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填空题
从方框中选词并用其适当形式填空。
            health, orange,they,China,have
1. The two boys like ____ food,  they don't like American food.
2. David ______ got some apples.
3. Vegetables and fruit are ______ food,  We should eat them every day.
4. How many ______ are there in the bag?
5. Those are ______ favourite food.
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