单项选择题

What is man's intelligence decided by

A．A large brain.
B．A small brain.
C．The environment.
D．Not precisely mentioned here
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单项选择题
Just like the author stated here, ______.
A．the brain of an elephant accounts for 1/50 of his total weight
B．many kinds of animals have brains larger than men have
C．man's brain seldom weighs much over three pounds
D．in proportion to his total weight, man's brain is the largest of animal brains
单项选择题
This article is mainly about ______.
A．the weight of a whale's brain
B．the brains of geniuses
C．the size of a person's brain and his intelligence
D．the intelligence of the elephant
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