单项选择题

These new assistants are more intelligent than their______.

A．descendants
B．predecessors
C．successors
D．ancestors
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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
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
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