题目

下列有机物的命名正确的是A．   2—乙基丙烷B．CH3—CH=CH—CH3  2—丁烯C．   3,4─二甲基戊烷D．           二甲基苯  答案：B解析: Now he works in my university as Professor of Chemistry ________ he’s been working very hard in the past 15 years.A.with whomB.whichC.for whichD.that