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  3. In the past, the global average temperature may have been 27℃. The release of large quantities of the greenhouse gas methane as

In the past, the global average temperature may have been 27℃. The release of large quantities of the greenhouse gas methane as

admin2009-08-19  47
问题 In the past, the global average temperature may have been 27℃.
The release of large quantities of the greenhouse gas methane as permafrost melts will speed up ______.
选项
答案further warming
解析 根据题干中的信息词permafrost和speed up定位到第七个小标题下的第三段，可知全球变暖将导致一些会加速进一步变暖的变化，例如说随着永久冻结带的融化所释放出的大量温室气体甲烷，由此可得答案。
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大学英语六级

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