单项选择题

He was fired because of his ______ refusal to follow orders.

A．obstinate
B．obedient
C．obsolete
D．obstructive
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单项选择题
Many students find ______ jobs during their summer holidays.
A．contemptible
B．temperate
C．temporary
D．contemporary
单项选择题
Our research has focused on a drug which is so ______ as to be able to change brain chemistry.
A．powerful
B．influential
C．monstrous
D．vigorous
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