题目内容

单选(10分)The president acknowledged that he had somehow ________ his ability to communicate to the American people.

A. broken down
B. failed in
C. came to nothing
D. be defeated

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单选(10分)Unfortunately, as history has shown, some of the companies are guilty of misconduct ________ profit.

A. go after
B. in the pursuit of
C. seek for
D. run after

单选(10分)We see many special education directors trying to ________ the quality of their programs with much less money and much smaller staff.

A. hold
B. keep
C. maintain
D. promise

单选(10分) People there are told it is their ________ duty to support the national economy by buying their own products.

A. patriotic
B. patriotist
C. patriotism
D. patriot

已知逻辑函数Y=AB+A'C+B'C，试求与其相等的函数为（）。

AB
B. AB+A'C
C. AB+B'C
D. AB+C