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14.The earth is 4600million years old.Modern man has lived on the earth for only 35000years,but during this period we have changed our planet a lot in many ways.Some things we've done are very good for the earth while some are not good.
All over the world,people have cut down millions of trees.When it rains or when the wind blows,the earth is taken away.Forests have become desert,so more and more different sorts of animals and plants are disappearing.
In big cities,cars and buses have polluted(污染)the air.Many people in cities now have health problems.
Factories have also polluted the land and the water.As a result,many rivers and lakes are now dead.
Around the earth,there's a special kind of oxygen called"ozone"(O3).It is important and helpful to the earth.But now air pollution is destroying it and that has made a very big hole in the ozone layer(臭氧层).Too much harmful radiation from the sun passes through the hole and reaches the earth.This is very dangerous because this radiation can cause cancer.
Carbon dioxide (CO2)in the air has increased a lot.It comes from burning oil,coal and wood.This has formed(形成)a"blanket"around the earth.The heat from the sun can't escape so the temperature is rising.This is called"the greenhouse effect"(温室效应).It causes the level of the sea to rise and the climate of the earth to change.
All these problems are very serious,so we must do something now.

54.How old is our planet?C
A.It's about 35000years old.
B.It's less than 35000years old.
C.It's about 4600million years old.
D.It's more than 35000years old.
55.Which of the following is not true?B
A.Cars can pollute the air.
B.The fewer trees,the better.
C.Factories can pollute the water.
D.Not all the things we have done are good for the earth.
56.In the passage"blanket"refers toA.
A.carbon dioxide around the earth
B.the ozone layer in the sky
C.the forest around the world
D.pollution all over the world.

分析 这篇短文讲述的是由于人类的活动,对地球造成的一些影响.人类的很多行为对地球是有利的,但是更多的行为是对地球有害的.作者主要从水污染、空气污染、土壤污染和对未来的希望来论述的这一话题.

解答 54-56 CBA
54.C.细节理解题.根据短文第一段中The earth is 4600million years old可知地球已经46亿 年了,故选C.
55.B.推理判断题.根据短文第二段All over the world,people have cut down millions of trees.When it rains or when the wind blows,the earth is taken away.Forests have become desert,so more and more different sorts of animals and plants are disappearing.可知应该多种树,可知树越多越好,故选B.
56.A 推理判断题.根据Carbon dioxide (CO2)in the air has increased a lot.It comes from burning oil,coal and wood.This has formed(形成)a"blanket"around the earth可知来自煤,油和树木的二氧化碳形成了二氧化碳层环绕着地球,故选A.

点评 本题首先要通读全文,了解大意,紧紧抓住上下文语境所提供的信息,然后明确词意和词的搭配,并注意上下连贯,合乎逻辑,最后通读全文,细心检查.

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