Clear [1] and dark[ƚ]are allophones of the same one phoneme /1/.They never take the same position in sound combinations， thus they are said to be in c（） distribution.

填空题In the course of time， the study of language has come to establish close links with other branches of s（） studies， such as sociology and psychology.

单项选择题Which of the following best states the behaviorist view of child language acquisition （）.

A.Language acquisition is a process of habit formatio
B.Language acquisition is the species-specific property of human beings
C.Children are born with an innate ability to acquire language
D.Humans are equipped with the neural prerequisites for language and language use

单项选择题Language and thought may be viewed as two independent circles overlapping in some parts. When language and thought are identical or closely parallel to each other， we may regard thought as “subvocal speech，” and speech as “（）”.

A.vocal thought
B.subvocal thought
C.covert thought
D.overt thought

单项选择题The way in which people address each other depends on their age, sex, social group and personal relationship. The English system of address forms frequently used includes first name, last name, title+last name, （）, and kin term.

A.title+first name
B.title+title
C.title alone
D.first name+last name+title

单项选择题The term （） linguistics may be defined as a way of referring to the approach which studies language change over various periods of time and at various historical stages.

A.synchronic
B.diachronic
C.comparative
D.historical comparative