4.C。科学家Ram Oren认为大众对树叶作用的观点过于乐观。态度判断题。关键语句: He says that earlier estimates on the ability of forests to absorb carbon dioxide were overly hopeful. 可见他认为普通观点过于乐观。
5.A。对应段落里的 it 指二氧化碳。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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