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阅读材料，完成下列要求。 材料一：恩格斯阐述了科学社会主义产生的历史过程，指出唯物辩证法使马克思作出了唯物史观和剩余价值学说这两大发现，而两大发现又使社会主义学说从空想变成了科学。文中指出：“这种历史情况也决定了社会主义创始人的观点。不成熟的理论是和不成熟的资本主义状况、不成熟的阶级状况相适应的。”——《反杜林论》材料二：在列宁登上历史舞台之前，俄国曾经出现过许多共产主义小组。其中，一个名叫维拉·Mason’s Clothing ShopClothesColorPriceSocksWhite, Blue＄4TrousersBlack＄10SweatersRed, White＄8T-shirtsRed, Green, Black＄7HatsBlack, Red＄6★ You can have a 20% discount（打折）if one of your parents is a teacher.【1】Which item costs the least(最少的) money?A. Hats. B. T-shirts. C. Trousers. D. Socks.【2】How much are two sweaters and a hat?A. ＄14 B. ＄20 C. ＄21 D. ＄22【3】You can buy at Mason’s Clothing Shop.A. black trousers B. a blue sweater C. a green hat D. red socks【4】You like red and you have only＄6. What can you take?A. A sweater B. A hat C. A T-shirt D. A pair of socks【5】Jim’s father is a teacher. He’d like to buy a pair of socks, a pair of trousers and a hat. How much will he pay?A. $20. B. $18. C. $16. D. $14.