（）language belongs to the Sino-Tibetan Family.

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

A.neurons
B.nerve system
C.nerves
D.cerebral cortex

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（）refers to a word or expression that is prohibited by the “polite” society from general use.

A.Linguistic taboo
B.Euphemism
C.Address term
D.Slang

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