单项选择题

How many states in the U.S.A have been threatened by snakeheads

A．Three
B．Four
C．Five
D．Six
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单项选择题
According to Mr. Gilmore the spread of snakehead is ______.
A．based on legal means
B．by illegal means
C．in an Asian fish store's favor
D．out of economic consideration
单项选择题
It is implied that China ______.
A．took 10 years to double its real incomes per head
B．has caught up by adopting advanced countries' technology
C．will see a sustained economic growth in the coming years
D．accounts for the bulk of world production
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