39.Differentiating highly proficient language learners from less proficient language learners is their mastery of a large stock of semi-fixed lexical phrases, also known as ______.
(A)chunks
(B)diction
(C)formulation
(D)lexis

Fixed expression

【定義】A fixed expression is a standard form of expression that has taken on a more specific meaning than the expression itself

(1) compound words

【例】english-speaking, co-pilot

(2) phrases strictly speaking

【例】call it a day, by the way, in any case

(3) clauses or sentences

【例】What's the matter? How are you? Excuse me!

＊proverbs(諺語) and some idioms(慣用語) are a particular class of fixed expression

    -- proverbs : No news is good news, Practice makes perfect

    -- fixed idioms : draw the line, rains cat and

Semi-fixed expression

【定義】Semi-fixed expressions are phrases or idioms that retain the same basic word order throughout. But some semi-fixed expressions can change some of their parts.

【例】take [sth.] into account, hold [sb.] responsible, [make] the right decision, [have] a good time

(1) Sub-sets of these are phrasal verb :

【例】take up, get away with, look up, bring about

(2) idioms can be semi-fixed : 

【例】[cost/pay] an arm and a leg, [lose] [one's] head 

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