题目内容

垄断市场形成了较低的价格和较高的产量，不会带来无谓损失。()

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“生产者主权”的生产者通过庞大的广告、通讯网络和推销机构对消费者进行劝说。()

小明吃一个苹果的效用为10，吃两个苹果的效用为12，吃三个苹果的效用为10，则第三个苹果的边际效用为2。()

No matter how frequently____，the works of Beethoven always attract large audiences in the

A. performing
B. performed
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Although my grandpa is very old, he is not slow____ mind to learn how to set up an Internet account.

A. on
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C. in
D. at