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

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• 1In 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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• 2One 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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• 3Many 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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• 4Commercials 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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• 5According 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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• 6According 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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• 7According 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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• 8Among “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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• 9The 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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• 10The directions were so ________ that it was impossible to complete the assignment.

  A.ingenious

  B.ambitious

  C.notorious

  D.ambiguous

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