单项选择题

A．They work at the zoo.
B．They are probably students majoring in art.
C．They enjoy watching elephants.
D．They are going to feed the elephants.
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单项选择题
A．It represents remarkable technological development.B．It will do less harm to environment than other planes.C．We will benefit from its fuel efficiency and aviation.D．It will not solve the problem of damaging environment.
A．It represents remarkable technological development.
B．It will do less harm to environment than other planes.
C．We will benefit from its fuel efficiency and aviation.
D．It will not solve the problem of damaging environment.
填空题
The mayor said severe measures would be taken ___________________(说到饮用水的污染)．
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