Which of the following is NOT one of the characteristics of idioms（）
A. The part of speech of each element in an idiom is very important.
B. The constituents of idioms can eplaced. ’ t be r
C. The word order in an idiom can ’ t be changed.
D. An idiom functions as one word.
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Which of the following statements is TRUE（）
A. Grammatical meaning refers to the part of speech, tenses of verbs and stylistic features ofwords.
B. Unlike conceptual meaning, associative meaning is unstable and indeterminate.
C. Affective meaning indicates the listener ’ s attitude towards the person or thing in question
D. Collocation cannot affect the meaning of words.
Words that are identical only in spelling but different in sound and meaning are called ______.
A. perfect homonyms
B. homographs
C. homophones
D. homonyms
Which of the following is NOT one of the extra-linguistic factors that cause changes in meaning（）
A. Cultural reason.
B. Historical reason
Class reason
D. Psychological reason
One can figure out the meaning of “ airmail ” to be “ mail by air ” by its ______.
A. onomatopoeic motivation
B. morphological motivation
C. semantic motivation
D. etymological motivation
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