题目内容
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： Do you have a tough math test coming up？ Then listen to some classical piano music just before the test. You might come up with a higher score. Researchers at a university in California conducted an experiment. They asked a group of college students to listen to some piano music by a famous 18th century composer before taking a math test. They were surprised to find that the students' scores jumped 8 to 9 points. The music seems to excite nerve activities in the brain; similar to the activity that occurs when a person is figuring out a math problem. However, the scientists warn before you get too excited about applying this method to your math test, you should remember that brain exciting effects last only 10 or 15 minutes. Would rock music work as well as the piano music did？ No, the scientists say. In fact, the less complex music might even interfere with the brain's reasoning ability.
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It would be a mistake to think that drugs that have an impact on memory necessary will have an effect on intelligence.
Dr. Joe Z Tsien is a professor of mloecular biology at Harvard.
听力原文： Most of us have an image of such a normal or standard English in pronunciation, and very commonly in Great Britain this is "Received Pronunciation", which is often associated with the public schools, Oxford, and the BBD. At the same time, it must be remembered that so far as the English-speaking countries are concerned, this "Received Pronunciation" approached the status of a "standard" almost only in England. Educated Scots, Irishmen, Americans, Australians, and others have their own different images of a standard form. of English.
Even in England it is difficult to speak of a standard in pronunciation. Pronunciation is infinitely variable, so that even given the will to adopt a single pronunciation, it would be difficult to achieve. There is no sure way of any two people saying the same word with precisely the same sound. In this respect pronunciation much more closely resembles handwriting than spelling. In spelling, there are absolute distinctions which can be learnt and imitated with complete precision: One can know at once whether a wont is spelt in a standard way or not. But two person' s handwritings and ciations may both be perfectly intelligible，yet have obvious differences without out being able to say which is“better”or more“standard”．
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Out of the seven pollutants mentioned in the first half of the article, hybrid cars produce fewer pollutants in at least five cases.
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