单项选择题

Farming in Middle West is favorable chiefly because ______.

A．it's technology-intensive
B．it's labor-intensive
C．weather conditions there are very good
D．natural sources there are very good
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单项选择题
Most of corn and wheat is ______.
A．sold to feed people
B．exported to foreign countries
C．sold to fatten cattle and pigs
D．sold as food
单项选择题
The American blacks were outraged to learn that Martin Luther King was arrested and imprisoned for peaceful disobedience ______ unjust laws.
A．of
B．with
C．to
D．from
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