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
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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
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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