单选题
Now a paper in Science argues that organic chemicals in the rock come mostly from ______ on earth than bacteria on Mars.
A、
configuration
B、
constitution
C、
condemnation
D、
contamination
【正确答案】
D
【答案解析】
contamination污染；致污物。configuration结构；配置。 constitution宪法；体质；构造。condemnation批评责难；(罪的)宣告。
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