单项选择题
In a fog the ______ is very poor,
A．probability
B．flexibility
C．reliability
D．visibility
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单项选择题
Cultivated crops and grazing lands ______ less than one-third of the world's land are
A． take upB. take inC. take onD. take down
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单项选择题
Mr. Wright is not______ now, but I am sure he'll be famous some day!
A．prominent
B．magnificent
C．dominant
D．significant
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