题目

阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。Jinan, the capital city of East China’s Shandong province, will host an international winter swimming competition at Daming Lake Scenic Area on January 12 and 13. A total of 956 swimmers from 31 countries and regions, 【1】 (include) the United States, Russia and Britain, will take part in the【2】 (enjoy) event.【3】 (host) by the Jinan local government, the Jinan winter swimming race has been held for six successive years. It will act 【4】 a warm-up event for the fort10．下列各组物质不属于同分异构体的是（　　）A．2，2-二甲基丙醇和2-甲基丁醇B．邻氯甲苯和对氯甲苯C．2-甲基丁烷和戊烷D．乙酸乙酯和丙酸丙酯