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  3. What was scientists’ understanding of methane? To test whether plants are a source of methane, the scientists created

What was scientists’ understanding of methane? To test whether plants are a source of methane, the scientists created

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问题 What was scientists’ understanding of methane?
To test whether plants are a source of methane, the scientists created
选项 A、a oxygen-free environment.
B、an environment with the same concentration of oxygen as the Earth has.
C、a carbon dioxide-free environment.
D、an environment filled with the greenhouse gas.
答案B
解析 第三段第一句说，科学家使用密封的房间来做实验，房间里氧气的浓度与地球大气中的氧气浓度相仿。所以B句符合原文的意思，其他三个选择则不符合原文内容。
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