66. What is the main idea of this passage?
(A) Lexical phrases are analyzable by the rules of grammar.
(B) There are different kinds of lexical phrases.
(C) The use of lexical phrases is dual in nature.
(D) Learners’ use of lexical phrases is related to their language development.

Lexical phrases(片語) have been shown to have a positive effect on learners’ language proficiency, learners’ expertise in writing in the target language, as well as on learners’ capacity to communicate by means of the target language. The use of lexical phrases is also related to oral fluency(口語流暢), particularly at the beginning of second language acquisition. Lexical phrases may be treated as wholes, either as complete or partially preassemble(預備的) units. As such, they are stored in the lexicon(辭庫) as unanalyzed chunks(區塊) just like words. Being ready-made, they are easily retrieved(檢索). Consequently, they offer learners the possibility of expressing themselves in the absence(缺乏) of rich linguistic(語言學) resources. Beginners—children, elementary students, and particularly adults, who have already developed their cognitive and semantic structures(語意結構) but lack the linguistic tools necessary to use the target language—become conversationally competent(有能力的) without the need to know the underlying(隱含的) structure of these phrases. Lexical phrases prove highly motivating by developing fluency at very early stages and thus promote a sense of achievement. One aspect(特點) that may indirectly help the development of oral competence is that the use of lexical phrases raises learners’ pragmatic(實用的) awareness and also increases their confidence in the target language: lexical phrases serve as lexical routines(慣例) that facilitate(促進) fluency. Another important aspect is that they facilitate language development. Lexical phrases allow for the expansion of previously acquired knowledge as learners become more proficient(熟練). The reason for this is that they have associated functional uses. Lexical phrases may be used to maintain a conversation, change the topic, make a request, greet people, and so on(題目寫one錯誤，應為and so on等等 的意思). This functional feature of lexical phrases offers learners the possibility of expressing the same function in increasingly more difficult ways by expanding an initial(起初的) formula(慣例). Therefore, it constitutes(被視為) a springboard(跳板) for language development.