您正在浏览:主页 > 游戏新闻 > 最新托福经典阅读练BT版雷霆之怒网页游戏习详解：Geology and Landscape
作者：雷霆之怒公益服 来源：http://www.edmi.com.cn 时间：2019-05-10 09:11
wearing them into yet more sand. Even living things contribute to the formation of landscapes. Tree roots force their way into cracks in rocks and, in so doing, speed their splitting. In contrast, the roots of grasses and other small plants may help to hold loose soil fragments together, thereby helping to prevent erosion by the wind. 1. ○ 4
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