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
In the Middle West, frost may appear in ______.
A．late spring
B．early spring
C．late summer
D．early autumn
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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