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Lead deposits, which accumulated in soil and snow during the 1960's and 7

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Lead deposits, which accumulated in soil and snow during the 1960's and 7

题文


Lead(铅) deposits, which accumulated(增加) in soil and snow during the 1960's and 70's, were primarily the result of leaded gasoline emissions originating in the United States. In the twenty years that the Clean Air Act has mandated(托管) unleaded gas use in the United States, the lead accumulation world-wide has decreased greatly.
A study published recently in the journal Nature shows that air-borne leaded gas emissions from the United States were the leading contributor to the high concentration of lead in the snow in Greenland. The new study is a result of the continued research led by Dr. Charles Boutron, an expert on the impact of heavy metals on the environment at the National Center for Scientific Research in France. A study by Dr. Boutron published in 1991 showed that lead levels in arctic (北极的) snow were declining(减少).
In his new study, Dr. Boutron found the ratios of the different forms of lead in the leaded gasoline used in the United States were different from the ratios of European, Asian and Canadian gasoline and thus enabled scientists to differentiate (分区) the lead sources. The dominant lead ratio found in Greenland snow matched that found in gasoline from the United States.
In a study published in the journal Ambio, scientists found that lead levels in soil in the North-eastern United States had decreased markedly since the introduction of unleaded gasoline. Many scientists had believed that the lead would stay in soil and snow for a longer period.
The authors of the Ambio study examined samples of the upper layers of soil taken from the same sites of 30 forest floors in New England, New York and Pennsylvania in 1980 and in 1990. The forest environment processed and redistributed (再分配)the lead faster than the scientists had expected. Scientists say both studies show that certain parts of the ecosystem (生态系统 ) respond rapidly to reductions in atmospheric pollution, but that these findings should not be used as a license to pollute.
1. The study published in the journal Nature indicates that ________.
A. the Clean Air Act has not produced the desired results
B. lead deposits in arctic snow are on the increase
C. lead will stay in soil and snow longer than expected
D. the US is the major source of lead pollution in arctic snow
2. Lead accumulation worldwide decreased significantly after the use of unleaded gas in the US ________.
A. was discouraged   B. was carried out by law
C. was forbidden by law   D. was introduced
3. How did scientists discover the source of lead pollution in Greenland?
A. By analyzing the data published in journals like Nature and Ambio.
B. By observing the lead accumulations in different parts of the arctic area.
C. By studying the chemical elements of soil and snow in Northeastern America.
D. By comparing the chemical compositions of leaded gasoline used in various countries.
4. The authors of the Ambio study have found that ________.
A forests get rid of lead pollution faster than expected
B. lead accumulations in forests are more difficult to deal with
C. lead deposits are widely distributed in the forests of the US
D. the upper layers of soil in forests are easily polluted by lead emissions
5. It can be inferred from the last paragraph that scientists ________.
A. are puzzled by the mystery of forest pollution
B. feel ease by the use of unleaded gasoline
C. still consider lead pollution a problem
D. lack enough means to combat lead pollution 题型:未知难度:其他题型

答案


小题1:D
小题2:B
小题3:D
小题4:A
小题5:C

解析

考点

据考高分专家说,试题“Lead(铅) deposits, wh.....”主要考查你对 [人生感悟类阅读 ]考点的理解。

人生感悟类阅读

人生感悟类阅读的概念

生活感悟类的文章就是指能给人心灵以启迪,使人从中受到教育的文章。这类文章的体裁可以是记叙文,如生活中一些感人故事或情感故事,有点类似心灵鸡汤一样的短文。

生活感悟类阅读解题指导:

一、文章特点:
生活感悟类的文章就是指能给人心灵以启迪,使人从中受到教育的文章。这类文章的体裁可以是记叙文,如生活中一些感人故事或情感故事,有点类似心灵鸡汤一样的短文。有时故事的结尾会有一句“点睛之笔”,点出全文的中心思想,就像《伊索寓言》里的寓言一样。还可能是夹叙夹议的哲理散文或生活随笔。散文随笔通常会阐述一种朴素易懂,耳熟能详的人生道理或宝贵品质。文章的结构和议论文类似,一般是总分总或总分结构。每段首句或尾句为主题句(论点),其它句子围绕主题展开论述(论据),论证方法多种多样,或举例,或引用名言,或正反对照等。

二、解题技巧:

针对生活感悟类文章的特点,做这类文章的完形填空时,要特别注意以下几点:
1、重点理解全文的首句。如果是记叙文,找出when,where,who,what等基本要素。如果是散文随笔,充分理解文章的中心句—全文的主题。
2、阅读全文的结尾段或结尾句,有助于理解文章所阐述或蕴含的哲理、感悟或忠告等。
3、调动自己的背景知识和情感。这类文章不会讲大道理也不会涉及到一些很专业的知识技术领域,而是谈一些小事和简单的道理,所以如果读者能和作者产生感情上的共鸣,读者会更好地把握作者的意图态度,从而提高做题的准确度。因此,考生在平时要做一个有心人,即用心去感悟生活中发生的小事,思考人生的一些基本道理,多阅读一些短小精悍的美文,多写写自己的心情故事和对生活学习的感悟。只有平时多用心,做题时才能调动自己的背景知识和情感。

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