2. 外语
  3. In the past, the global average temperature may have been 27℃. A U.S. scientific report concluded that some trends of climate c

In the past, the global average temperature may have been 27℃. A U.S. scientific report concluded that some trends of climate c

admin2009-08-19  60
问题 In the past, the global average temperature may have been 27℃.
A U.S. scientific report concluded that some trends of climate change were caused by ______.
选项
答案human activities
解析 根据题干中的信息词U. S. scientific report和trends定位到第八个小标题下的第三段，可知美国政府委派的一份科学报告总结出，有明确证据表明人类活动的确会导致气候变化，该报告指出，过去50年间所见的趋势无法单独用自然作用来解释，由此可得答案。
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