阅读理解 There are veral advantages in planting trees: they firm the soi

题文

阅读理解 There are veral advantages in planting trees: they firm the soil, soak up(吸收) extra water and take carbon dioxide out of the atmosphere.  However, it now turns out that planting trees could add to global warming. We all know that 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 the 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.   Dust from China is carried east and left in the Pacific Ocean. If a treeplanting programme is successful and the dust supply reduced, the next result may be that less carbon dioxide gets locked away in the ocean.   Andy, an environmental scientist, has spent the past few years studying dust and says his work shows clearly the complexity of the system. For this reason the need is to focus on cutting carbon dioxide giving off rather than doing anything el.   Robert, an American scientist, has shown that when native grassland areas are invaded 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 grass, so less carbon goes directly into the soil from trees." said Robert.   In wet areas of the world, the gain from trees absorbing carbon dioxide above ground ems to be outweighed by the loss of carbon from the soil below ground.   Countries that plan to fight against global warming by planting trees may have to think again. Solutions to environmental problems are often more complex than they first appear, and understanding the Earth's climate is a very great challenge.  1. People usually hold the opinion that________.  A. huge dust storms can destroy carbon dioxide B. planting trees could reduce global warmingC. huge dust storms can destroy the oceans on the Earth D. planting trees is the only way to control huge dust storms2. Andy, an environmental scientist, believes that________.  A. environmental problems are more complex than expectedB. trees shouldn't have been planted in dry places C. dust plays a more important part than trees D. carbon dioxide is harmful to everything3. Robert's experiment proves that________.  A. trees absorb more carbon than grassB. carbon can turn grass into dust C. less carbon can make trees grow fasterD. grassland areas should be covered by forests4. The best title for this passage is "________".  A. The importance of planting trees B. The dust clouds soak up carbon dioxideC. Is it really uful to plant trees to reduce global warming?D. Why the soil carbon disappears? 题型：未知难度：其他题型

答案

1-4: BAAC

解析

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考点

据考高分专家说，试题“阅读理解 There.....”主要考查你对 [健康环保类阅读 ]考点的理解。 健康环保类阅读

健康环保累阅读概念：

健康环保类文章常是介绍科学知识、生活常识和环境保护方面的短文。体裁有记叙文、 说明文、议论文和各种应用文。

健康环保类文章阅读技巧：

   健康环保类文章常是介绍科学知识、生活常识和环境保护方面的短文。阅读此类短文要以现象或事物为中心进行思考，理解现象产生的原因、条件和客观规律等。同时要抓住事物的特征、用途和相互关系等。科普环保类文章一般为说明文，从结构上看大致可分为三个部分：   第一部分一般是文章的首段，主要用来提出文章的主题，即文章想要阐述、说明的主要内容；   第二部分是文章的主体，可由若干个段落组成，对文章的主题进行展开说明；   第三部分是结尾段，对文章的主题进行归纳总结。这类文章多用一般现在时，而且一般多使用客观性词语表述。有时为了强调客观性，也常使用被动语态。   从近几年的考试题来看，科普环保类的文章越来越与人们的实际生活相接近。由于此类文章缺乏故事情节，很多同学对此类文章感到费解。但一般的科普类文章都是就事论事，需要逻辑推理和想象的时候较少，因此此类阅读题也没有同学们想象中的那么难，只要多加训练，就能较好地答题。【阅读策略】 1、概要(Summarizing)：  阅完材料后，将所阅材料浓缩，摘要，做出所阅材料的书面或口头梗概。 2、组织(Organization)：  阅读后根据阅读内容，识别观点、人物、事件之间的关系以及文章的结构关系。如：时间关系、比较或对比关系、相关关系及因果关系等。