单项选择题

Local residents tired hard to protect this _______ of elephants from being killed.

A．crowd
B．school'
C．herd
D．flock
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单项选择题
A small car is more ________ than a large car, because it uses less petrol.
A．economical
B．economic
C．thrifty
D．advantageous
单项选择题
Al said that he wouldn't mind _______.
A．to wait for us
B．walling for us
C．wait for us
D．for waiting us
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