单项选择题

Responding to emerging diseases such as SARS is______ to responding to a bioterrorist attack in which they resemble a sudden appearance of an agent spreading in, a population.

A．identical
B．vertical
C．parallel
D．specific
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单项选择题
These new assistants are more intelligent than their______.
A．descendants
B．predecessors
C．successors
D．ancestors
单项选择题
Young horses may develop a______ cough before and during exercise, particularly when cold air is breathed in during warming-up exercise or under dusty conditions.
A．perpetual
B．permanent
C．chronic
D．sustained
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