Many commercials begin with a cheerful song of some kind because ________.

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• 1Commercials create the sensation of loudness because ________.

  A.TV stations always operate at the highest sound levels

  B.their sound levels are kept around peak levels

  C.their sound levels are kept in the middle frequency ranges

  D.unlike regular programs their intensity of sound varies over a wide range

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• 2According to the passage, the maximum intensity of sound coming from commercials ________.

  A.does not exceed that of programs

  B.is greater than that of programs

  C.varies over a large range than that of programs

  D.is less than that of programs

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• 3According to Van Galen some home schoolers believe that ________.

  A.public schools take up a herd-like approach to teaching children

  B.teachers in public school are not as responsible as they should be

  C.public schools cannot provide an education that is good enough for their children

  D.public schools are the source of bureaucracy and inefficiency in modern society

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• 4Most home schoolers’ opposition to public education stems from their ________.

  A.respect for the interest of individuals

  B.worry about the inefficiency of public schools

  C.concern with the cost involved

  D.devotion to religion

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• 5Home-school advocates are of the opinion that ________.

  A.things in public schools are not so bad as has often been said

  B.their tolerance of public education will attract more kids to public schools

  C.home schooling is superior and, therefore, they will not easily give in

  D.their increased cooperation with public school will bring about the improvement of public education

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• 6One of the reasons why commercials are able to attract viewer attention is that ________.

  A.the human voices in commercials have more auditory impact

  B.people like cheerful songs that change dramatically in sound quality

  C.high-frequency sounds are used to mask sounds that drown out the primary message

  D.they possess sound qualities that make the viewer feel that something unusual is happening

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• 7In the passage, the author is trying to tell us ________.

  A.how TV ads vary vocal sounds to attract attention

  B.how the loudness of TV ads is overcome

  C.how advertisers control the sound properties of TV ads

  D.how the attention-getting properties of sounds are made use of in TV ads

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• 8Why does the author say that the protection of endangered species is a highly controversial issue、

  A.Because people can’t agree as to what species to protect.

  B.Because it is difficult to find an effective way to protect such species.

  C.Because it affects the interests of certain groups of people.

  D.Because it is a major problem involving a series of legal procedures.

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• 9According to the passage, the preservation of rain forests ________.

  A.may hamper a developing country in its fight against poverty

  B.benefits developed countries rather than developing countries

  C.should take priority over the control of human population

  D.will help improve the living conditions in developing countries

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• 10According to the passage, cutting tress to grow more food ________.

  A.will widen the gap between the developed and the developing countries

  B.is but a short-term relief to the food problem

  C.can hardly alleviate the shortage of food

  D.proves to be an effective way out for impoverished nations

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