题目

Charles Yerkes, a wealthy American businessman, _______the job improving the system by obtaining ______of the many different lines. A . overtook; invitation B . undertook; authority C . underwent; reputation D . undertook; ownership 答案：D17．用氯气给自来水消毒，某学生用自来水配制下列物质的溶液，药品不会产生明显变质的是（　　）A．石蕊B．硝酸银C．亚硫酸钠D．氯化铝