单项选择题

Some of these "upside down" airmail stamps are now __ over $6,000.

A．worth
B．worthwhile
C．worthy
D． worthed
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单项选择题
Difficulties and hardships have the best qualities of the young geologist.
A．brought out
B．brought about
C． brought in
D．brought up
单项选择题
I believe that truth and justice are to an enduring social order.
A．formation
B．fundamental
C．fountain
D．friction
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