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According to the author, what should students do at the moment？
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Part A
Directions: Read the following four texts. Answer the questions below each text by choosing A, B, C or D . Mark your answers on ANSWER SHEET 1.
Of the estimated 10,000 and 20,000 words that make up the average American's vocabulary, slang constitutes about 10 percent, according to the authors of the Dictionary of American Slang. Although slang words represent a rather small segment of our English language, they are often the liveliest, most innovative and most colorful words we use.
There is something sensual and tactile about many slang words, which borrow heavily from the vocabularies associated with food. Hands are called meat hooks; loved ones are called honey, sweet pie or sugar; someone whose intellect is suspect is a fruitcake, cabbage head or just plain nuts.
"The primary function of slang is to adorn your speech, to be lively, witty and new. Newness is the essence of slang," says David Pharies, professor of linguistics at the University of Florida. One of the main purpose of using slang is to solidify one's identification with a group. Slang is most prevalent among the young and among such groups as blacks, teenagers, drug users, criminals, carnival workers, hobos and the uneducated. Often, slang is used as a code language to fortify the group and to exclude outsiders. Some criminal slang, called cant, is so highly developed that pickpockets, for example, can carry on a conversation in front of a victim without the person's realizing that they are discussing which pocket to pick.
Americans, in general, use more slang than other nationalities because of our diversity, emphasis on free speech, immigrant heritage and lack of a formal, national language academy. The mobility of American bas further spread regional expressions that have become general slang.
According to the passage, most of the slang words
？Look at questions 1-5.
？In each question, which sentence is correct？
？For each question, mark one letter (A, B or C).
Evening dress necessary. ______ .
Many observers of contemporary American life believe that we are witnessing a historical change and the first major impact of the shift from an energy economy to an information economy. For 300 years technology has been cast in a mechanical model, one based on the combustion processes that go on inside a star like the sun. The steam engine opened the mechanical age, and it reached its apex with the discovery of nuclear fission and nuclear fusion, which replicated the energy producing processes of a star. We now seem to be moving toward a biological model based on information and involving the intensive use of materials. Although biological processes need physical energy and materials, they tend to substitute information for both. Biological processes "miniaturize" size, energy, and materials by "exploding" information. The human brain is some ten times the size, and weight of the brain of a monkey, but it handles a billion times more information. As a result, high tech industries are information intensive rather than energy or material intensive.
Sociologists have played and will continue to play an important role in assessing and interpreting these developments and other aspects of change.
It can be inferred that underlying the two changes is the change of
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