【参考答案】1—5、BCAAD
科普知识类
阅读下列四篇短文,从每小题后所给的A,B,C或D四个选项中,选出最佳选项。
Have you ever noticed the colour of the water in a river or stream after a heavy rainfall?What do you think caused this change in colour?It is soil that has been washed into the river from the riverbank or from the nearby fields. Components of Soil
Soil is made up of a number of layers(层),each having its own distinctive colour and texture. The upper layer is know as the litter. It acts like a blanket,limiting temperature changes and reducing water loss. The topsoil layer is made up of small particles of rock mixed with rotten plant and animal matter called humus(腐殖质),which is black and gives the topsoil its dark colour. This layer is usually rich in nutrients,oxygen,and water. Below the topsoil is the subsoil,a layer that contains more stones mixed with only small amounts of organic matter. This layer is lighter in colour because of the lack of humus. Beneath the soil lies a layer of bedrock.
Soil forms from the bottom up. Over time bedrock is attacked by rain,wind,frost,and snow. It is gradually broken down into smaller particles in a process called weathering. Plants begin to grow,and rotten materials enrich the topsoil. Most of the soil in Eastern Canada,for example,was formed from weathered rock that was exposed when the ice disappeared 12,000 years ago. Water Beneath the Soil
【2016届高考英语二轮复习阅读理解七十五十集之连载训练:(67)】相关文章:
★ 【课堂新坐标】2017届高考英语(通用版)二轮复习书面表达专题训练:技法3 丰富充实的细节信息(含解析)
★ 【课堂新坐标】2017届高考英语(通用版)二轮复习短文改错专题训练:模式3 错一词(含解析)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:21(含解析)
★ 天津市武清区杨村第四中学2016届高考英语一轮复习语法专题五《状语从句》课件外研版
★ 2014届高考英语一轮复习课时作业(二十二)必修4Module 4《Great Scientists》(外研版)
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (48)
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (66)
★ 四川省2016届高考英语一轮复习课时作业(36) Module 6 War and Peacel 外研版选修6
★ 【人教版】2014届高考英语一轮复习指导考点针对练:选修6 unit1《Art》
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21