单项选择题

It is clear that the dog has a much greater ______ of its brain devoted to smell than is the case with humans.

A．composition
B．proportion
C．compound
D．percent
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单项选择题
The cashier was asked to ______ every penny of the money that he took care of.
A．account to
B．use up
C．amount to
D．account for
单项选择题
It is reported that ______ adopted children want to know who their natural parents are.
A．the most
B．most of
C．most
D．the most of
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