单项选择题

The jobs of wildlife technicians and biologists seemed ______to him ,but one day he discovered their difference.

A．identical
B．vertical
C．parallel
D．specific
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单项选择题
In today's medical, little agreement exists on the______ for defining mental illness.
A．legislation
B．requirement
C．criteria
D．measures
单项选择题
You can't let the situation get worse. You must take ______.
A．decisions
B．sides
C．directions
D．steps
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