阅读理解It may sound strange, but cutting down a real tree for Christmas i,高中二年级,英语试题,健康环保类阅读考点,好技网

阅读理解
阅读理解
It may sound strange, but cutting down a real tree for Christmas is actually greener than going with
the artificial kind, one scientist says.
"It is a little confusing to people," said Clint Springer, a biologist at Saint Joseph's University in
Philadelphia. Because of concerns over deforestation(砍伐森林) around the world, many people
naturally worry that buying a real tree might contribute to that problem. But most Christmas trees for
sale these days are grown not in the forest but on tree farms for the purpose of being cut.
Moreover, from the viewpoint of greenhouse gases, real trees are "the obvious choice". Live trees
actively release oxygen as they grow, and meanwhile remove carbon dioxide from the atmosphere.
After they have been cut and Christmas is over, they're usually cut into smaller pieces formulch(覆
盖物). As mulch, the bits of trees very slowly release carbon dioxide back into the atmosphere. So in
the end, a real Christmas tree iscarbon neutral, putting the same amount of carbon dioxide back into
the air as it took out (although much more slowly).
The tree farms that grow the trees also replant after the trees are cut. Artificial trees, on the other
hand, don't come out even in the carbon balance.Petroleum(石油) is used to make the plastics in
artificial trees and lots of carbon dioxide-creating energy is required to make and transport them.
Because these trees just end up in the places where waste is buried under the ground after use, "those
greenhouse gases are lost forever," Springer said.

1. The author presents the text mainly by      .
A. giving descriptions
B. making comparisons
C. listing figures
D. analyzing different opinions

2. Real trees for Christmas are better than artificial trees probably because      .
A. real trees cost buyers less money
B. real trees are more beautiful
C. real trees don't cause any pollution
D. real trees can be used for a longer time

3. The underlined part "carbon neutral" in the third paragraph can be best replaced by "      ".
A. not releasing more carbon
B. absorbing carbon dioxide
C. causing much waste
D. releasing carbon dioxide

4. The purpose of the text is to tell us      .
A. the reasons for using real trees for Christmas
B. the environmental protection tips for Christmas
C. how to choose artificial Christmas trees
D. how to spend a much greener Christmas

本题信息：2013年同步题英语阅读理解难度较难来源:刘婷婷
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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。
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