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There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automobile traffic. At present, we realize that although these are the areas with the worst air pollution, the problem is literal

提问人:ylm发布时间:2021-04-28

56. As pointed out at the beginning of the passage, people used to think that air pollution _______.

  [ A ] cause widespread damage in the countryside

  [ B ] affected the entire eastern half of the United States

  [ C ] had damaged effect on health

  [ D ] existed merely in urban and industries areas

  57. As to the greenhouse effect, the author __________.

  [ A ] share the same view with the scientist.

  [ B ] is uncertain of its occurrence

  [ C ] rejects it as being ungrounded

  [ D ] thinks that it will destroy the world soon

  58. The word “offset” in the second paragraph could be replaced by _________.

  [ A] slip into [ B ] make up for

  [ C ] set up [ D ] catch up with

  59. It can be concluded that ____________.

  [ A ] raising the world’s temperature only a few degrees would not do much harm to life on earth.

  [ B] lowering the world’s temperature merely a few degrees would lead major farming areas to disaster.

  [C] almost no temperature variations have occurred over the past decade.

  [D] the world’s temperature will remain constant in the years to come.

  60. This passage is primarily about __________.

  [A]the greenhouse effect..

  [ B ] the burning of fossil fuels..

  [C] the potential effect of air pollution.

  [ D] the likelihood of a new ice age.

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