2. 外语
  3. According to the passage, a greenhouse is built to According to the passage, chlorofluorocarbon gases differ from carbon dioxid

According to the passage, a greenhouse is built to According to the passage, chlorofluorocarbon gases differ from carbon dioxid

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问题 According to the passage, a greenhouse is built to
According to the passage, chlorofluorocarbon gases differ from carbon dioxide in that
选项 A、they are more useful.
B、they are much heavier.
C、they are more efficient in making the world colder.
D、they are more effective in catching the heat from the sun.
答案D
解析
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