单词：chessboard system of square yard plots
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背诵为王第三册
Patterns 模型 A pattern has lines or shapes, and it is a kind of design. 模型有线条或形状，是一种设计。 Where can we find a pattern? 我们从哪里能找到模型呢？ Think about a chessboard. 想想棋盘吧。 The chessboard has
与美国小学生一起学英文第6册
By Erika Celeste Highway 11, Mississippi 06 June 2008 For the past 11 years, there's been a yard sale in the United States like no other. For one weekend each spring, it runs for 808 kilometers 807.71800 to be exact starting in the southern state of
VOA标准英语2008年（六月）
This is Scientific Americans 60-Second Science, Im Molly Webster. Got a minute? Some consumers buy organically grown foods because they believe the products are healthier, tastier and better for the environment. But is this assessment true? To find o
Scientific American(九)月
In the United States, the typical crop travels nearly 2,500 kilometers from field to table. While U.S. consumers express growing interest in local foods, farmland near urban areas is increasingly unaffordable. These challenges have led a school bus
VOA标准英语2008年（十月）
Can a tree help prevent crime? It just might. Two new studies, led by US Forest Service researchers, took a closer look at urban green space in Philadelphia, Baltimore and Youngstown, Ohio. In each of these cities, adding green space to crime-ridden
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