The passage gives a general description of ancient climate history. Scientists believe that the things people do that send ____

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问题 The passage gives a general description of ancient climate history.
Scientists believe that the things people do that send ______ gases into the air are making our planet warmer.

选项

答案greenhouse

解析 Scientists believe that the things people do that send ______ gases into the air are making our planet warmer.词汇线索为gas和warmer,定位后找到倒数第三段转折问后,则答案应该是 greenhouse。
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