单项选择题

The company often receives as many as five hundred letters ______ one day.

A．on
B．at
C．in
D．for
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单项选择题
He slept in the ______ of the trees on such a hot day.
A．shade
B．shelter
C．shadow
D．shield
单项选择题
______ natural resources it is one of the poorest countries in Western Europe.
A．In the form of
B．By means of
C．In terms of
D．On the basis of
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