题目

现有下列物质： ①Cl2       ②Na2O2       ③NaOH        ④HCl       ⑤H2O2        ⑥Na2O       ⑦NH4Cl        ⑧CO2 （1）只由离子键构成的物质是________________(填序号，下同) （2）只由极性键构成的物质是______ （3）只由非极性键构成的物质_______________     （4）由极性键和非极性键构成的物质是_____________  （5）由离子键和极性键构成的物质是___________ （6）由离子键和非极性键构成的物质是______________ （7）属于离子化合物的是___—Was the trip pleasant when you vacationed in the mountain village last summer? —No, it ________ for four days when we arrived, so the roads were very muddy. [　　] A．was raining B．would be raining C．had been raining D．have rained