荣德剖析

章节摘录

　　Soil forms from the bottom up. Over time bedrock is attacked byrain， wind， frost， and snow. It is gradually broken down into smallerparticles in a process called weathering. Plants begin to grow， and rottenmaterials enrich the topsoil. Most of the soil in Eastern Canada， forexample，was formed from weathered rock that was exposed when the icedisappeared 12，000 years ago.　　Water Beneath the Soil　　Surface water collects and flows above the ground in lakes， ponds， andrivers. Once in the soil or rock， it is called groundwater. Gravity pullsgroundwater through the soil in a process called percolation .Eventually the water reaches a layer called the water table. Under this isbedrock through which water cannot percolate.　　As water percolates downward， it dissolves organic matter andminerals from the soil and carries them to deeper layers. This causes aserious problem because plants require these nutrients for growth. Soil pH　　Soil can be acidic，neutral，or basic. The pH of the soil is determinedby the nature of the rock from which it was formed and by the nature ofthe plants that grow and rot in it.　　The acidity of rain and snow can lower the pH Of the groundwaterthat enters the soil. By burning fossil fuels such as coal，oil and gasoline，humans have been contributing to higher levels of acidity in many soils. 　　......

书籍目录

Unit 1 Women of achievementA 助跑篇·夯实基础I．教材知识·句句讲B 加速篇·延伸拓展Ⅱ．一课一背·进步快Ⅲ．三易点·早知道C 冲刺篇·高考在平时Ⅳ．高考题·关关闯Unit 2 Working the IandA 助跑篇·夯实基础I．教材知识·句句讲B 加速篇·延伸拓展Ⅱ．一课一背·进步快Ⅲ．三易点·早知道C 冲刺篇·高考在平时Ⅳ．高考题·关关闯Unit 3 A taste of English humourA 助跑篇·夯实基础I．教材知识·句句讲B 加速篇·延伸拓展Ⅱ．一课一背·主生步快Ⅲ．三易点·早知道C 冲刺篇·高考在平时Ⅳ．高考题·关关闯Unit 4 Body languageA 助跑篇·夯实基础I．教材知识·句句讲B 加速篇·延伸拓展Ⅱ．一课一背·进步快Ⅲ．三易点·早知道C 冲刺篇·高考在平时Ⅳ．高考题·关关闯Unit 5 Theme parksA 助跑篇·夯实基础I．教材知识·句句讲B 加速篇·延伸拓展Ⅱ．一课一背·进步快Ⅲ．三易点·早知道C 冲刺篇·高考在平时Ⅳ．高考题·关关闯参考答案及剖析

作者简介

《荣德基剖析新课标新教材:高中英语(必修4)(配人教)》是一部彻底渗透新课标理论的教辅书。荣德基老师通过对人类接收与掌握知识的思维方式的研究，科学地设置了“基础、应用（拓展）、拔高、练习”的模块结构，让学生步步为营，系统地学习知识；循序渐进，高效地提高能力。

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