单项选择题

It has been proved that cockroaches (蝉螂) ______ for several weeks even after their heads have been cut off.

A．are surviving
B．can survive
C．surviving
D．that survive
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单项选择题
A person who is constantly worried about the loss of ______ job is not likely to do very good work.
A．his
B．their
C．one's
D．one
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