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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单项选择题
The entertainment agency that______ me a membership card is operated by a foreign investor.
A．approves
B．authorizes
C．rectifies
D．endows
单项选择题
He admitted that he shouldn't have been so______ as to say insulting words to the immigration officer who had refused his application.
A．impatient
B．tolerant
C．crude
D．indignant
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