托福阅读教程汇总和更新

　　During the second half of the nineteenth century, the production of food and feed crops in the United States... [查看全文]

　　The end of the nineteenth century and the early years of the twentieth century were marked by the developmen... [查看全文]

　　The mineral particles found in soil range in size from microscopic clay particles to large boulders. The most... [查看全文]

　　In July of 1994, an astounding series of events took place. The world anxiously watched as, every few hours,... [查看全文]

　　The history of clinical nutrition, or the study of the relationship between health and how the body takes in... [查看全文]

　　The spectacular aurora light displays that appear in Earth’s atmosphere around the north and south magnet... [查看全文]

　　Although only 1 person in 20 in the Colonial period lived in a city, the cities had a disproportionate infl... [查看全文]

　　Throughout the nineteenth century and into the twentieth, citizens of the United States maintained a bias agai... [查看全文]

　　The sculptural legacy that the new United States inherited from its colonial predecessors was far from a rich... [查看全文]

　　讲小蜜蜂。分为 honeybee和worker bee。讲了honeybee是怎么寻找蜜源和如何告诉同伴蜜源的位置的。开头先说蜜蜂和 termite白蚁 与很... [查看全文]