题文
LONDON: What could possibly be wrong with planting trees? The advantages are obvious; they firm the soil, soak up (摄取) extra water and take carbon dioxide (二氧化碳) out of the atmosphere.However, it now turns out that planting trees could add to global warming.
Tree roots do a great job of keeping soil firmly on the ground and out of the wind’s power. The problem is that some of those dust clouds play an important part in soaking up carbon dioxide.
Huge dust storms blow out over the oceans from dry parts of North Africa and central Asia. Tons of dust are lifted and left as a thin film over the ocean surface. The dust fuels oceanic life.
Dust from China is carried east and left in the Pacific Ocean. If a tree-planting programme there is successful and the dust supply reduced, the net result may be that less carbon dioxide gets locked away in the ocean.
Andy Ridgwell, an environmental scientist from the University of East Anglia, has spent the past few years studying dust and says his work “shows clearly the complexity of the system and the importance of not tinkering(粗劣地修补) with it without understanding the results. For this reason there is the need to focus(集中) on cutting carbon dioxide giving off rather than monkeying (瞎弄) about with the land surface.”
An American scientist, Robert Jackson, has shown that when native grassland areas are invaded(侵入) by trees, carbon is lost from the soil. “We are studying why the soil carbon disappears, but one theory is that trees do a lot more of their growing above ground compared to grasses, so less carbon goes directly into the soil from trees, ” says Jackson.
In wet areas of the world, the gain from trees absorbing carbon dioxide above ground seems to be outweighed(超过) by the loss of carbon from the soil below ground. Countries that plan to combat global warming by planting trees may have to think again. Solutions(解决办法) to environmental problems are often more complex than they first appear, and understanding the Earth’s climate is a very great challenge.
小题1:People usually hold the opinion that A．huge dust storms can destroy carbon dioxideB．huge dust storms can destroy the oceans on the earthC．huge dust storms can’t do anything beneficial for manD．planting trees is the only way to control huge dust storms小题2:Andy Ridgwell, the environmental scientist, believes that A．dust plays a more important part than treesB．trees shouldn’t have been planted in dry placesC．carbon dioxide is harmful to everything on the earthD．environmental problems are more complex than expected小题3:Robert Jackson’s experiment proves that A．grassland areas should be covered by forestsB．trees hold more carbon than grassC．carbon can turn grass into dustD．less carbon can make trees grow faster小题4:The underlined word “combat” in the last paragraph means A．learn aboutB．fight againstC．live withD．give up 题型：未知 难度：其他题型
答案
小题1:C
小题2:D
小题3:B
小题4:B
解析
文章介绍了一种新的理论，认为种树也是有很多的缺点的，文章做了具体的说明。小题1:C 推理题。根据第三段第二行The problem is that some of those dust clouds play an important part in soaking up carbon dioxide，人们根本就不知道沙尘暴还有四首二氧化碳的作用，可知C正确。
小题2:D 推理题。根据第四段2,3行shows clearly the complexity of the system and the importance of not tinkering(粗劣地修补) with it without understanding the results以及最后一段Solutions(解决办法) to environmental problems are often more complex than they first appear可知D正确。
小题3:B 推理题。根据倒数第二段，最后2行one theory is that trees do a lot more of their growing above ground compared to grasses, so less carbon goes directly into the soil from trees可知B正确。
小题4:B 猜测词义题。根据Countries that plan to combat global warming by planting trees may have to think again可知这是与全球变暖进行的斗争，故Ｂ正确。
考点
据考高分专家说，试题“LONDON: What could p.....”主要考查你对 [政治经济类阅读 ]考点的理解。政治经济类阅读
政治经济类文章的概念：
要做好这类阅读，平时就要注意了解国内外发生的政治经济大事，掌握一定背景知识，对这类文章的叙述特点及内容安排有一定了解，还要扩展这方面的词汇。阅读这类文章，要抓住文章的核心，即文章整体和各段主要在说什么，也要注意段落之间的逻辑关系。
如何备考政治经济类阅读理解题：
【题型说明】政治经济类阅读文章是高考常选材料之一。该类文章时代气息浓郁，语言鲜活，但熟字新义词、超纲词及专业词语多，长句、难句多。政治类文章大多数是同学们感性趣的内容，读起来倒有似曾相识的感觉，经济类文章读起来就像是雾里看花，文章看完，一头雾水。再加之这类文章的命题侧重于词义猜测、推理判断和文章主旨，同学们对这类题材是望而生畏。
【备考策略】建立心理优势。针对不同体裁的文章，我们要采取相应的阅读方法和技巧。政治类文章多采用记叙文形式，我们可采取“顺读法”，以便抓关键语句，领会文章主旨；而经济类文章则多采用说明文形式，我们则可以采取“逆读法”，先读试题，再从文章中查找有用信息。若遇到的确难读的材料。千万不用着急，因为你觉得难，其他人也一定是同感。在高考前，我们就要有这种心理准备，高考试卷肯定有一、两篇难以阅读的材料。不过，我们平时可以有意识地从报刊杂志上找一些较难的阅读材料来阅读，以培养自己迎难而上的心理素质。
【答题方法】
1、寻找主干：
根据英语中五种基本句型结构，把句子中的主语、谓语、宾语、表语等主要成分找出来，其他成分如定语、状语、补语等则易于理解。找到了句子主干，句子的意思至少明白了一半。
2、剔除从句：
在一个长句中可能会出现若干个从句，在理解时，如果把各个从句剔除出来单独理解，然后把大意拼凑起来，整个长句的意思就会明白六、七分。
3、辨别分句：
一个长句如果是由几个并列、转折、递进、对比关系的分句组成，句中往往有表示这些分句关系的连接词，只要能弄清楚分句和分句之间的逻辑关系，再把各层分句的意思加以连贯，整个长句的句意基本上能跃然脑中。
4、寻找关键词：
如果一个句子看完，一点句意的感觉也没有，下下策就是抓住句中的关键词，通过关键词大体弄懂这个长句的意思。
