单项选择题

Lying under the skull, the human brain contains an average of () nerve cells called neurons.

A. 100 million
B. 10 billion
C. 100 billion
D. 10 million

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单项选择题
Which of the following is NOT the primary function of the left hemisphere of the brain().

A. Analytic reasoning.
B. Temporal ordering.
C. Associative thought.
D. Visual and spatial skills.
单项选择题
A signal coming in the left ear will go to the () hemisphere.

A. right
B. left
C. front
D. back
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