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As is well-known, the brain performs a very important ____________，which controls the nerve system of the body．

A. motion                  B. action           C. function           D. fact

As is well?known，the brain performs a very important ________，which controls the nerve system of the body.

A．motion 　　　　B．a(chǎn)ction　　　　　 C．function 　　　　　 D．fact

As is well?known，the brain performs a very important ________，which controls the nerve system of the body.

A．motion B．a(chǎn)ction　 C．function D．fact