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(臭氧層).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"(溫室效應(yīng)).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 這篇短文講述的是由于人類的活動,對地球造成的一些影響.人類的很多行為對地球是有利的,但是更多的行為是對地球有害的.作者主要從水污染、空氣污染、土壤污染和對未來的希望來論述的這一話題.

解答 54-56 CBA
54.C.細(xì)節(jié)理解題.根據(jù)短文第一段中The earth is 4600million years old可知地球已經(jīng)46億 年了,故選C.
55.B.推理判斷題.根據(jù)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.可知應(yīng)該多種樹,可知樹越多越好,故選B.
56.A 推理判斷題.根據(jù)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可知來自煤,油和樹木的二氧化碳形成了二氧化碳層環(huán)繞著地球,故選A.

點評 本題首先要通讀全文,了解大意,緊緊抓住上下文語境所提供的信息,然后明確詞意和詞的搭配,并注意上下連貫,合乎邏輯,最后通讀全文,細(xì)心檢查.

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