[单项选择]People can still talk about Anglo-Saxons today even though they came to Britain in the 5th century. This feature of language is called（　）.
A. Arbitrariness.
B. Duality.
C. Creativity.
D. Displacement.

[简答题] People today are still talking about the generation gap(代沟). Some parents complain that their children do not show them proper respect, while children complain that their parents do not understand them at all. What has gone wrong Why has the generation gap appeared One important cause is that young people want to choose their own life style. In more traditional societies, when children grow up, they are expected to live in the same area as their parents, to marry people on their children are another cause of the generation gap. Parents often expect their children to do better than they do, to find better jobs, to make more money; the high wishes that parents place on their children are another cause of the generation gap. Finally, the high speed of social changes deepens the gap. In a traditional culture, people are valued for their wisdom, but in our society today the knowledge of a lifetime may be out of use overnight(隔夜). According to the passage, children

[填空题]People here still keep their lifestyle today ______ (殊不知他们的习惯对他们自己和后代都有害).

[判断题]

Today I want to talk about levels of language usage. You probably have noticed that people express similar ideas in different ways, depending on the situation they are in. This is very natural. All languages have two general, broad categories, or levels of usage: a formal level and an informal level. English is no exception. I’m not talking about correct and incorrect English. What I’m talking about are two levels of correct English. The difference in these two levels is the situation in which you use a particular level. Formal language is the kind of language you find in textbooks, reference books such as encyclopedias, and in business letters. For example, a letter to a university would be in formal style. You would also use formal English in compositions and essays that you write in school. People usually use formal English when they give classroom lectures or speeches and at ceremonies such as graduations. We also tend to use formal language in conversations with