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In the past, the global average temperature may have been 27℃. [br] A U.S. scien
In the past, the global average temperature may have been 27℃. [br] A U.S. scien
游客
2023-09-15
35
管理
问题
In the past, the global average temperature may have been 27℃. [br] 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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