文档介绍：智课网 TOEFL 备考资料老托福精选阅读全套真题【 199910 】摘要:托福阅读常考的 10中题型(细节题、排除题、推断题、修辞目的题、词汇题、指代题、句子简化题、插入句子题、文章内容小结题和图表题)前六中题型是从老托福附中继承下来的,建议前 6题型采用老托福试题集训练。老托福精选阅读全套真题: Potash (the old name for potassium carbonate) is one of the two alkalis (the other being soda, sodium carbonate) that were used from remote antiquity in the making of glass, and from the early Middle Ages in the making of soap: the former being the product of heating a mixture of alkali and sand, the latter a product of alkali and vegetable oil. Their importance in munities of colonial North America need hardly be stressed. 小马新托福阅读资料分享群【机经+真题+TPO+OG+ 模拟】 Potash and soda are not interchangeable for all purposes, but for glass-or soap-making either would do. Soda was obtained largely from the ashes of certain Mediterranean sea plants, potash from those of inland vegetation. Hence potash was more familiar to the early European settlers of the North American continent. The settlement at Jamestown in Virginia was in many ways a microcosm of the economy of colonial North America, and potash was one of its first concerns. It was required for the glassworks, the first factory in the British colonies, and was produced in sufficient quantity to permit the inclusion of potash in the first cargo shipped out of Jamestown. The second ship to arrive in the settlement from England included among its passengers experts in potash making. T