单项选择题

How to evaluate the performance of students is still a problem that troubles many professors.

A．examine and judge
B．assist in
C．enhance
D．account for
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单项选择题
Many workers felt that they were victimized by automation.
A．made to work hard
B．replaced
C．caused to suffer
D．relieved
单项选择题
The emperor turned to alchemy to ensure immortality, but contrary to his wishes, the wrong chemistry shortened his life.
A．good fortune
B．quick recovery from his illness
C．never-ending life
D．everlasting peace
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