In the past, the global average temperature may have been 27℃. [br] A U.S. scien

游客2024-06-14  12

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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