题目

Mason’s Clothes StoreClothesColorPricesockswhite, blue$4trousersblack$11sweaterred, white$8T-shirtred, green, black$7Hatblack, red$6【1】Which is the cheapest of all?A.Hat. B.Trousers. C.Socks.【2】How much are two sweaters and a hat?A.$22. B.$21. C.$20.【3】You can buy ______.A.black socks B.black trousers C.a green sweater【4】You like black and you only have $7. You can take ______.A.trousers B.a hat C.socks【5】How many kinds of color are there in Mason’s store?A.Eight. B.Six. C.Five.有十种物质：①铁丝；②CO气体；③CO2气体；④硫酸；⑤CaO固体；⑥盐酸；⑦(NH4) 2SO4晶体；⑧熔融NaOH；⑨液态氯化氢；⑩酒精，以上物质中：（1）属于非电解质的有       （填代号），属于酸性氧化物的有          （填代号），题中所示状态能导电且属于电解质的有          （填代号）。（2）属于盐的物质其电离方程式为：                             。