2. 外语
  3. What is the purpose of this passage? The word "it" (Para. 6) probably refers to ______.

What is the purpose of this passage? The word "it" (Para. 6) probably refers to ______.

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问题 What is the purpose of this passage?
The word "it" (Para. 6) probably refers to ______.
选项 A、carbon dioxide
B、nitrogen
C、atmosphere
D、coal
答案A
解析 词意判断题。关键语句;"The companies say that rising levels of carbon dioxide in the atmosphere will not create harmful global warming Instead, they say it will increase forests and other plants."可见应是二氧化碳,其余选项与本段无关。
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