专四

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

参考答案：D进入在线模考
【译文】最近《科学》杂志上刊登的一篇文章指出，该岩石中的有机化学成分大部分是来自地球的污染，而不是来自于火星上的细菌。
【解析】形近名词词义辨析题。A．configuration,“轮廓，结构”；B．constitution“宪法，体质，构造”；C．condemnation“谴责，定罪”：D．contamination“污染”。

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