单项选择题

For the practice teaching, the students had to visit some local schools for the ______ of lessons.

A. examination
B. inspection
C. observation
D. investigation
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单项选择题
_________ drills that have no real topic have to remain as they are.
A. Manufacture
B. Manipulative
C. Manipulate

D. Manifest
单项选择题
We work to make money, but it's ______ that people who work hard and long often do not make the most money.
A. dilemma
B. conflict
C. prejudice
D. paradox
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