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Industrial emissions of sulfur dioxide (SO2) impede cloud formation, lowering temperatures in regions with high SO2 emissions. Computer modeling suggests that beginning about 1950, the climate of North America and Europe cooled because of SO2 emissions there, and that this cooling in turn caused the tropical rain belt to move southward, away from Africa’s Sahel region. Therefore, industrial emissions in Europe and North America were probably a major cause of the severe Sahel droughts of the 1970s and 1980s.
Which of the following, if true, most strongly supports the position argued in the passage? (A) During the 1970s and 1980s, industrial SO2 emissions increased rapidly in East Asia.
(B) The effects of the Sahel drought on the local food supply were exacerbated by overgrazing of pasture that could recover less quickly in the arid conditions.
(C) The Sahel region is subject to a natural cycle of droughts, with which the severe Sahel droughts of the 1970s and 1980s coincided.
(D) Since 1950, many of the industrial emissions in North America and Europe have been of substances other than SO2 that tend to cause temperatures to increase.
(E) Rainfall in the Sahel increased following a decline in North American SO2 emissions that began in the late 1980s.
Much of the materials in landfills is paper and other organic materials that decompose gradually. Since these materials decompose much faster when wet, keeping landfills wet would free up space in them faster, thereby both reducing the need for new landfills and slowing expansion of existing landfills. Northwest Environmental Commission is considering a proposal to install watering systems in landfills with the aim of reducing the landfills’ adverse environmental impact on the region. Which of the following, if true, most strongly supports the prediction that the proposal, if adopted, will not have the intended effect? A Organic material that is kept wet decomposes even faster, if it is also kept warm. B Installing watering systems in landfills would add significantly to the costs of landfill management. C Keeping landfills wet increases the risk that polluted water will leak out into streams, rivers, and lakes. D Paper and cardboard that are wet are more easily compressed and therefore take up less space. E Some of the material in landfills do not decompose more rapidly when exposed to moisture.
参考答案：EC
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发表于 2021-9-27 22:43:35
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