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  3. In a plausible but speculative scenario, oceanographer Douglas Martinson suggests that temperature increases caused by global wa

In a plausible but speculative scenario, oceanographer Douglas Martinson suggests that temperature increases caused by global wa

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问题 In a plausible but speculative scenario, oceanographer Douglas Martinson suggests that temperature increases caused by global warming would not significantly affect the stability of the Antarctic environment, where sea ice forms on the periphery of the continent in the autumn and winter and mostly disappears in the summer. True, less sea ice would form in the winter because global warming would cause temperatures to rise. However, Martinson argues, the effect of a warmer atmosphere may be offset as follows. The formation of sea ice causes the concentration of salt in surface waters to increase; less sea ice would mean a smaller increase in the concentration of salt. Less salty surface waters would be less dense and therefore less likely to sink and stir up deep water. The deep water, with all its stored heat, would rise to the surface at a slower rate. Thus, although the winter sea-ice cover might decrease, the surface waters would remain cold enough so that the decrease would not be excessive.
According to the passage, which of the following is true about the sea ice that surrounds the Antarctic continent?
选项 A、The amount of sea ice that forms in the winter has been declining.
B、Most of the sea ice that forms in the winter remains intact in the summer.
C、Even small changes in the amount of sea ice dramatically affect the temperature of the surface waters.
D、Changes in the amount of sea ice due to global warming would significantly affect the stability of the Antarctic environment.
E、Changes in the amount of sea ice affect the degree of saltiness of the surface waters.
答案E
解析 Choice E is correct: according to the passage, "less sea ice would mean a smaller increase in the concentration of salt." Choices B, C, and D are incorrect because they are all contrary to the information presented in the passage. Choice A is incorrect because the passage does not compare current amounts of sea ice with past quantities; it instead proposes a hypothetical scenario involving a possible future decline of sea ice formation.
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