单项选择题

The reader of a book belongs to ______________ of communication.

A．the source
B．the message
C．the destination
D．none of them above

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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

单项选择题

The richest farming regions of the U.S. are in____________.

A．New England
B．Wisconsin
C．Midwestern and northeastern parts
D．Midwestern parts

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