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

单项选择题（）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

单项选择题The smallest meaningful unit of language is（）.

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

单项选择题（）morphemes are those that cannot be used independently but have to be combined with other morphemes, either free or bound, to form a word.

A.Free
B.Bound
C.Root
D.Affix

单项选择题Language is arbitrary in that there is no logical connection between meanings and（）.

A.words
B.sounds
C.objects
D.ideas

单项选择题According to F. de Saussure,（）refers to the abstract linguistic system shared by all the members of a speech community.

A.parole
B.performance
C.langue
D.language