单项选择题

According to the passage, the Pony Express riders are ________.

A．orphans
B．well over 18
C．skillful can-drivers
D．courageous and brave young men
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A series of robberies ________ recently.
A．has been reported
B．has reported
C．have been reported
D．have reported
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Our country is trying to ________ the serious problems created by the environment pollution.
A．comply with
B．cope with
C．cope to
D．comply to
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