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

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• 1One 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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• 2Many commercials begin with a cheerful song of some kind because ________.

  A.pop songs attract viewer attention

  B.it can increase their loudness

  C.advertisers want to make them sound different from regular programs

  D.advertisers want to merge music with commercials

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• 3Commercials 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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• 4According 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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• 5According 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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• 6Why 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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• 7According 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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• 8According 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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• 9Among “humanity’s current problems” (Line 6, Par

  A.3), the chief concern of the scientists is ________.A.the impoverishment of developing countries

  B.the explosion of the human population

  C.the reduction of biological diversity

  D.the effect of global warming

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• 10The author’s purpose in writing this passage is ________.

  A.to describe the difficulties in solving humanity’s current problems

  B.to present the different views on humanity’s current problems

  C.to analyze the contradiction between countries in dealing with humanity’s current problems

  D.to point out that humanity’s current problems can only be solved through the cooperation of nations

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