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一、Explain-the-fllowing-terms

1． CAI and CAL

【答案】 Computer-assisted instruction （CAI ） means the use of a computer in a teaching program. This includes:

a. A teaching program which is presented by a computer in a sequence. The student responds on the computer , and the computer indicates whether the responses are correct or incorrect.

b. The use of computers to monitor student progress, to direct students into appropriate lessons, material , etc. This is also called computer-managed instruction.

Parallel to CAI , there is CAL （Computer-Assistant Learning ） . The former aims at seeing educational problems on the part of the teacher, whereas the latter emphasizes the use of a computer in both teaching and learning in order to help the learner achieve educational objectives. The first kind of CAL programs which were developed reflected principles similar to programmed instruction. The computer leads the student through learning task step-by-step, asking questions to check comprehension. Depending on the studenfs response, the computer gives the student further practice or progresses to new material （see branching ）. In more recent CAL courseware students are able to interact with the computer and perform higher-level tasks while exploring a subject or problem.

2． Diglossia

【答案】 When two languages or language varieties exist together in a community and each one is used for different purposes, this is called diglossia. Usually, the more standard variety can be called the high variety or H-variety , which is used in government , the media , education , and for religious services. The other one is usually a non-prestige variety, the low variety or L-variety used in the family, with friends, when shopping, etc.

3． Hyponymy

Hyponymy. It refers to the sense relationship between a more general, more inclusive and 【答案】

a more specific word. The word which is more general in meaning is called the superordiante, and the more specific words are called its hyponyms. For example , the hyponymy relationship could be established between “animal” and “rabbit”.

4． Design features

【答案】 Design features : It refer to the defining properties of human language that tell the difference between human language and any system of animal communication.

5． The London School of Linguistics

【答案】 The London School generally refers to the kind of linguistic scholarship in England. The man who turned linguistics proper into a recognized distinct academic subject in Britain was J.R. Firth.

6． Endocentric construction

【答案】 Endocentric construction : An endocentric construction is one whose distribution is functionally equivalent, or approaching equivalence, to that of one or more of its constituents, i.e. a word or a group of words , which serves as a definable center , or head. Hence an endocentric construction is also known as a headed construction. Noun phrases like “Lovely Lucy” are typical endocentric constructions.

7． Concordance

【答案】 The computer has the ability to search for a particular word , sequence of words , or perhaps even a part of speech in a text. The computer can also retrieve all examples of a particular word. It can also calculate the number of occurrences of a certain word so that information on the frequency of the word may be gathered. We may also be interested in sorting the data in some way—for example, alphabetically on words occurring in the immediate context of the word. This is usually referred to as concordance.

8． Speech community

【答案】 Speech community is a group of people who share a set of norms and expectations regarding the use of language. Speech communities can be members of a profession with a specialized jargon , distinct social groups like high school students or hip-pop fans. In addition, online and other mediated communities, such as many internet forums, often constitute speech communities. Members of speech communities will often develop slang or jargon to serve the group's special purposes and priorities.

二、Essay-question

9． What , in your view , makes a text a text , rather than a series of unconnected utterances? What are the implications of your answer for second language teaching?

【答案】 The factor to distinguish connected texts which make sense from those which do not is usually described as coherence. Coherence is traditionally described as the relationships that link the ideas in a text to create meaning for the readers, apart from cohesive devices. It should be noticed that cohesion by itself would not be sufficient to enable us to make sense of what read or hear; it is quite easy to create a highly cohesive text which has a lot of connections between the sentences, but which remains difficult to interpret. And coherence , as the invisible net of a text , performs a function of “connectedness” which makes the text interpretable to people.

Regarding the importance of coherence to a whole text, it seems necessary for a teacher of SFL to help students develop coherence in writing. Research has found that in their writing, ESL/EFL students focus almost exclusively on the word and sentence levels rather than the level of the whole discourse, that is , textual coherence. A pedagogical focus on coherence can shift students' attention from sentence-level grammar to discourse features such as textual structuring and propositional unity, which are crucial to creating meaning in texts. Indeed, helping students improve the coherence of their writing ought to be a significant aspect of L2 writing instruction.

To help students focus on coherence in writing , it is essential that teachers have a thorough understanding of what makes a text coherent. As is shown in the composition text books , it seems common to regard coherence simply as connectedness between sentences , use of explicit cohesive devices at the paragraph level, and use of connective devices such as pronouns, repetitive structures, and transitional markers. However , coherence should not be narrowed in terms of sentence-level connectedness and paragraph unity rather than discourse unity.

Thus , to help students create coherence in their writing, it is necessary for teachers to pay more attention in the broader sense of coherence.

10．Semantic change plays a very important role in widening the vocabulary of a language.

【答案】 Semantic change plays a very important role in widening the vocabulary of a language. Since language is symbolic, each word serves as a symbol in relation to a specific meaning. In this sense, we need infinite numbers of words or symbols to code the physical entities and our experiential concepts. But this is impossible for communication. Therefore, users give a new concept to an old form, thus the meaning of a form is multiplied. There are three kinds of semantic changes , namely , broadening , narrowing , and meaning shift. Class shift and folk etymology also contribute to change in meaning.

Semantic broadening refers to the process in which the meaning of a word becomes more general or inclusive than its historically earlier denotation. For example, the word holiday used to mean “holy day” in religious English. It means “a day for rest” today regardless of its religious nature , and hence its meaning is widened.

Semantic narrowing is a process in which the meaning of a word becomes less general or inclusive than its historically earlier meaning. For example, the Old English word “hund” （“hound”）was once used for any breed of dog; whereas in Modem English its meaning has been narrowed to a particular kind of dog.

Semantic shift is a process of semantic change in which a word loses its former meaning and acquires a new , sometimes related ，meaning. For example , the word “silly” meant “happy” in Old English , and “naive” in Middle English，but “foolish” in Modem English.

11．Illustrate the ways of lexical change.

【答案】 Lexical change includes invention, blending, abbreviation, acronym, back-formation, analogical creation, borrowing, compound and derivation.

a.Coinage : it is the invention of totally new terms. The most typical sources are invented trade names of one company‟s product that become general terms for any version of that product. Such a s Kleenex ，Teflon and Xerox.

b.Borrowing : it is the taking over of words from other languages. The English language has adopted a vast number of words from other languages，such as encore, which is borrowed from French.

c.Compounding : it is the process of a joining of two separate words to produce a single form. For example , “fingerprint” is composed of “finger” and “print”.

d.Blending : blending is typically accomplished by jointing part of one word to the other whole word or other part of the word. For example, the word smog is formed by combing parts of two words “smoke” and “fog”.

e.Clipping : it occurs when a word of more than one syllable is reduced to a shorter form. Common example is like ad （“advertisement”）.

f.Backformation : it is a specialized type of word formation in which new words are coined from already existing words by “subtracting‟‟ an affix thought to be part of the old word. For example, the noun television first came into use and then the verb televise was created from it.

g.Analogical creation. It refers to the phenomenon that a new word or a new phrase is coined by analogy between a newly created one and an existing one. For example, „„marathon‟‟ appeared at the First Olympic Games and by analogy modem English created such words as “telethon”，“talkthon”.

h.Acronyms : some new words, known as acronyms, are formed form the initial letters of a set of other words. These can remain essentially “alphabetisims” such as CD （“compact disk”）where the