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  3. Climatologists observed in 1964 that a slow warming of the surface of the No

Climatologists observed in 1964 that a slow warming of the surface of the No

游客2025-02-19  45
问题     Climatologists observed in 1964 that a slow warming of the surface of the North Atlantic in the 1910s and 1920s could well have been driven by a surge of warm water up the Gulf Stream. This Atlantic warming accompanied a global warming that by the 1940s had produced the highest global temperatures to that point in the records. It was so warm that statistical techniques used in the 1990s to detect the “fingerprint” of greenhouse warming in climate records also show the 1940s having greenhouse warming. However, no one believes enough greenhouse gases had reached the atmosphere by then to cause much of a human-induced warming. That inconsistency has led greenhouse contrarians to claim that any recent warming could be natural rather than anthropogenic. [br] Which of the following statements about the global warming observed in the 1940s is implied by the passage?
选项 A、It was part of a climatic change that can be traced to the 1910s and 1920s.
B、Its cause was not apparent to climatologists until the 1990s.
C、It is doubtful that it was caused primarily by greenhouse gases produced by humans.
答案 A,C
解析 根据第一二句可知，1910年代和1920年代的北大西洋水温上升伴随有一场发生于1940年代的全球变暖，因此选项A正确。C项对应第四句，正确。B项文章中没提气象学家直到1990年代才发现了这次全球变暖的原因。
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