第17题: [单项选择]Now a paper in Science argues that organic chemicals in the rock come mostly from ______ on earth rather than bacteria on Mars. A. configuration B. constitution C. condemnation D. contamination 参考答案:B 答案解析:[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