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  3. Climatologists observed in 1964 that a slow warming of the surface of the North Atlantic in the 1910s and 1920s could well have

Climatologists observed in 1964 that a slow warming of the surface of the North Atlantic in the 1910s and 1920s could well have

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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.
It can be inferred that the “contrarians” mentioned in the passage would agree with which of the statements？
选项 A、The extent of the global warming that occurred between the 1940s and the 1990s has been exaggerated by some climatologists.
B、Changes in global temperatures in the 1990s are a part of a trend that is distinct from any trend that may have existed in the 1910s and 1920s.
C、Recent changes in global temperature may not be the direct result of human activity.
答案C
解析 对应第五句。A项这些反对者的观点应该是1940年代和1990年代的全球变暖的程度还没有强到会由人类引发，并没有提到是否被气象学家夸大。B项从文章中看不出两种趋势之间是不是一样的。
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