题目

 This park is ______ wonderful place for people to visit, ______ place where everybody can have a good time. A.      a; a                            B. a; the                       C. the; a                       D. a; 不填 答案：A能证明某烃分子里只含有一个碳碳双键的事实是（　　）A．该烃分子里碳氢原子个数比为1：2B．该烃能使酸性KMnO4溶液褪色C．该烃完全燃烧生成的CO2和H2O的物质的量相等D．该烃容易与溴水发生加成反应，且1mol该烃完全加成消耗1mol溴单质