單項選擇題

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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單項選擇題

（）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

單項選擇題

The smallest meaningful unit of language is（）.

A.root
B.affix
C.stem
D.morpheme