单项选择题

He called this an insult to the professional _________ of teachers and declared that the obligation of the U.S. labor movement is to improve the status of teachers.

A．humidity
B．commodity
C．integrity
D．liability
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单项选择题
Whenever I go out, I always keep a certain amount of money _________, in case of an emergency.
A．by hand
B．in hand
C．on hand
D．at hand
单项选择题
A friend is a person with whom I may be _________ Before him, I may think aloud.
A．splendid
B．solitary
C．soluble
D．sincere
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