2. 外语
  3. Now a paper in Science argues that organic chemicals in the rock come mostly from______on earth rather than bacteria on Mars.

Now a paper in Science argues that organic chemicals in the rock come mostly from______on earth rather than bacteria on Mars.

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问题 Now a paper in Science argues that organic chemicals in the rock come mostly from______on earth rather than bacteria on Mars.
选项 A、configuration
B、constitution
C、condemnation
D、contamination
答案D
解析 D选项contamination意为“污染物”。根据句意： “当前， 《科学》杂志上的一篇论文表明，岩石中的有机化学物质主要来自地球上的污染物而不是火星上的细菌”，故选D。 在其他三项中，A选项configuration：配置；B选项constitution：构成；C选项condemnation：谴责，都不符合句意。
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