题目

Dogs have a very good_____ of smell and are often used to search for survivors in an earthquake.    A. view        B. means               C. sense                        D. idea 答案：C 解析: 略下列说法不正确的是（　　）A．氯乙烯、聚乙烯、苯乙烯都是不饱和烃B．蛋白质溶液中加入浓的硫酸铵溶液会有沉淀析出C．苯能与溴在一定条件下发生取代反应D．淀粉和纤维素水解的最终产物都是葡萄糖