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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。()

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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
C. to be performed
D. being performed

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

A. on
B. to
C. in
D. at

You___ to the theme park yesterday, it has not been made open to the public yet.

A. couldn’t have gone
B. must have gone
C. needn’t have gone
D. should have gone