2. 外语
  3. As evidence that the Earth’s atmosphere is warming continues to accumulate, scientists are making slow progress toward an answer

As evidence that the Earth’s atmosphere is warming continues to accumulate, scientists are making slow progress toward an answer

admin2009-07-28  59
问题 As evidence that the Earth’s atmosphere is warming continues to accumulate, scientists are making slow progress toward an answer to the big question raised by the evidence: How much of the warming is due to human activity and how much to natural causes?
选项
答案地球大气层正在转暖，这种迹象日益明显，这向人们提出了一个重大问题，科学家们对这一问题也逐步给出了答案即：地球变暖在多大程度上应归咎于人类的活动，又在多大程度上是自然原因引起的?
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