单项选择题

Agriculture is the country's chief source of wealth, wheat ______ by far the biggest cereal crop.

A．is
B．been
C．be
D．being
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单项选择题
She is ______ a musician than her brother.
A．much of
B．much as
C．more of
D．more as
单项选择题
Although not an economist himself, Dr. Smith has long been a severe critic of the government's ______ policies.
A．economical
B．economy
C．economic
D．economics
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