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Scientists who study the climate are still arguing about how fast the earth is warming and how much it will warm, but they do agree that the earth is warming and that it will keep warming if we don’t do anything about it.
Scientists agree that the burning of fossil fuels (化石燃料) like oil and coal cause greenhouse gases to escape into the air and that these gases are causing most of the warming. Another cause is deforestation (cutting down trees) . Trees soak up carbon dioxide, one of the greenhouse gases, from the air.
There are already some changes happening because of global warming. Sea level is rising and some animals are already moving to new homes. It’s already too late to stop global warming completely.
If the warming gets worse, as scientists expect, there may be some kinds of plants and animals that is disappearing because they can’t move to new homes. There may be more storms and floods. Sea level may rise so much that people have to move away from the coasts. Some areas may become too dry for farming.
Global warming is a very difficult problem to fix. People are having a hard time agreeing on what to do about it. For example, everyone agrees that wasting energy is a bad thing to do. But some people think that the federal government (联邦政府) should make laws about it, while other people think it should be up to each person or business to decide what to do.
Many states and businesses in the United States are not waiting until the federal government decides what to do. They have already started working on the problem.
小题1:What are the scientists arguing about in the passage?
A. How fast is the earth warming?                  B. How much will the earth warm?
C. The earth will keep warming if we don’t do anything about it.    D. Both A and B.
小题2:What does the underlined phrase “soak up” mean?
A.take inB.grow upC.take offD.set up
小题3:What may be the causes of global warming?
A.The disappearance of plants and animals and the wasting energy.
B.The burning of fossil fuels and storms and floods.
C.The burning of fossil fuels and deforestation.
D.The rising of sea level and deforestation.
小题4:What is the best title of this passage?
A.The reason for global warmingB.How to stop global warming
C.The changes to the worldD.The global warming

小题1:D
小题2:A
小题3:C
小题4:D

试题分析:这篇短文主要介绍了全球变暖的两个主要原因以及会给人类生活带来的影响,告诉我们行动起来保护环境。
小题1:根据第一段Scientists who study the climate are still arguing about how fast the earth is warming and how much it will warm,描述,可知选D。
小题2:联系上下文,可知此处指的是,树木吸收二氧化碳。故选A,吸收。
小题3:根据短文第二段Scientists agree that the burning of fossil fuels (化石燃料) like oil and coal cause greenhouse gases to escape into the air and that these gases are causing most of the warming. Another cause is deforestation (cutting down trees) .描述,可知选C。
小题4:这篇短文主要讨论了全球变暖的问题。故选D,全球变暖。
点评:本文中长句较多,一时很难读懂句子含义,注意多读几遍,不要强求非得理解一词一句的含义,能把握文章大意就行。然后带着问题阅读短文,一般就能顺利找出答题依据。对于不能直接找到根据的问题注意联系上下文,根据短文中心总结出正确答案。
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