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1、课下题型练（一）Reading and ThinkingI .阅读理解ATrees are useful to man in three important ways： they give him wood and other useful things, they give him cool places, and they help to stop drought and flood.Unluckily, in many parts of the world, man has not found that the third of these points is the most impo
2、rtant.Man wants to make money from trees, so he has cut them down in large numbers, only to find that without them he has lost the best friends he had.And also, he is usually too careless to plant and look after new trees.So the forests slowly disappear.This does not only mean that man will have few
3、er trees.The results are even worse： for where there are trees, their roots break up soil 一 make the rain in 一 and also bind the soil, thus stopping it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich
4、 topsoil.When all the topsoil is gone, nothing is left but useless desert.语篇解读：本文是一篇说明文。文章主要介绍了树对人类的作用非常大，可以给人类 提供木材、提供阴凉，还可以帮助阻止干旱和洪水。但实际情况是很多人砍掉了很多树木， 破坏了植被，引起了生态危机。1 The most important points of trees to man is that A. they help him to stop drought and floodB. they help him to make moneyC. they g
5、ive him cool placesD. they give him wood and other things详细分析：选A 细节理解题。根据第一段内容及第二段中的Unluckily, in many parts of the world, man has not found that the third of these points is the most important.可知树 木的第三个用途stop drought and flood最重要，故A项正确。2. In many places forests slowly disappear because .A. many tre
6、es have been cut down by manB. new trees are not well looked afterC. man has not paid enough attention to planting treesD. all the above详细分析：选D 细节理解题。根据第二段中的Man wants to make money from trees, so he has cut them down in large numbers, only to find that without them he has lost the best friends he ha
7、d.And also, he is usually too careless to plant and look after new trees.So the forests slowly disappear可知A、B、C三项都是树林消失的原因。故D项正确。3. Land becomes desert after all trees are cut down because A. roots of trees break up the soilB , there are too many rainfallsC. strong winds bring a lot of sandD. there
8、are no longer trees to keep the rain and protect the topsoil.详细分析：选D 细节理解题。根据第三段中的The results are even worse: for wherethere are trees, . soil, thus stopping it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away
9、 the rich topsoil.When all the topsoil is gone, nothing is left but useless desert.可知，当树被砍掉 以后，再也没有树来保护水土了，导致土地变成了荒漠。故D项正确。4. Which title best fits the passage?A. Trees and ManB The Function of Tree WoodC. How do People do with Trees?D. The Usage of Tree Roots详细分析：选A 标题归纳题。本文介绍了树对人类的作用非常大，可以给人类提供木材、
10、提供阴凉，还可以帮助阻止干旱和洪水。但实际情况是很多人砍掉了很多树木，破 坏了植被，引起了生态危机。所以本文主要讲述的是树和人类的关系，A项作标题最能概 括本文内容，故A项正确。Organic food is very populanlt is also expensive.Some organic food costs twice as much as non-organic food, but new parents and pet owners are willing to pay up to 200% more for organic foodHowever, there are pe
11、ople who think it is a waste of money.There is one main difference between organic and non-organic foodOrganic farms donot use agricultural chemicals, such as pesticides.In many countries organic foods havespecial labels.These guarantee that the products are natural.Some people think organic means l
12、ocally grown.Originally this was true.Over time organic farming became more difficult.The demand for organic food grew larger than the supply.Small companies had to sell out to large companies.There weren，t enough organic ingredients, such as grain and cattle.This made it difficult for many organic
13、companies to stay in business.Today, many large companies have an organic line of products.Is organic food more nutritious? This is part of the debate.Many farmers and consumers believe it is.They think agricultural chemicals cause health problems such as cancer.Many health professionals disagree.Fe
14、w studies prove that organic foods prevent health problems.Health specialists worry more about bacteria, such as E. coli and salmonella.These can get into contact with organic and non-organic food.Doctors recommend washing produce very carefully.Handling meat carefully is important, too.Most people
15、agree that naturally grown food tastes better.Is tastier food worth the extra money? This is a matter of opinion.Whether it is healthier or not may require more research.However, organic consumers argue it is better to be safe than sorry.语篇解读：本文是一篇说明文。文章将有机食品和非有机食品进行了对比，并且就有 机食品的种植、营养价值和味道等情况进行了说明。5
16、. What is probably the major concern of organic food consumers?A. Price.B. Safety.C. Freshness.D. Variety.详细分析：选B 推理判断题。根据第二段中的Organic farms do not use agricultural chemicals, such as pesticides.可知有机农场不使用杀虫剂等农药。最后一段中的However, organic consumers argue it is better to be safe than sorry.也指出,有机食品消费者认为,安 全总比后悔好。由此可推知，有机食品消费者最关心的可能是安全。故选B。6. What is the doctors，suggestion?A , Grow your own food.
