14.Moving out,moving back     In the countries all over the world,people are leaving the countryside in large numbers to find jobs in the
cities.They leave because the countryside is much poorer than the city and often there isn't much work there.Services such as hospital and transport (交通) are usually much better in cities than they are in the country.(81)E
     But in the big cities of Europe and America-London,Pairs,New York,people are moving out of the city.These are usually families who have some money,and want to live a quieter life.They are tired of the noise and the dirt of the city,and the crowded streets,trains and buses.(82)B.They want a house with a garden,and clean air that isn't polluted.
     So they move out.Some don't go very far,just a little away from the city,to the towns near the cities; (83)CThere are sheep and cows and green fields.There,they start a new life and try to make new friends.
     (84)A.After two or three years,many people who have done this feel that it was a big mistake.They don't make so much money and there isn't much to do.The people are very different and aren't always very friendly.(85)D"It's wonderfulto see crowds in the streets and cinema lights,"they say,"I'm so glad I'm back in the city!"

A.However,not all of them are happy.
B.They don't want to sit in traffic any more.
C.Other people move to the real countryside.
D.As a result,many people move back to the city.
E.They hope that their lives will improve in the city.
13.The earth is 4,600 million years old.We humans have lived on the earth for only 35,000 years,but during this period we have changed our planet a lot in many ways.Some things we're done are evey good for the earth while some are bad.
    Fewer trees   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 deserts,so more and more sorts of animals and plants are disappearing.
    Traffic and factory pollution    In big cities,cars and buses have polluted the air.Now many people in cities have health proplems.Factories have also polluted the land and the water.As a result,many rivers and lakes are now dead.
    The ozone layer (臭氧层)    Around the earth,there's a special kind of oxygen(O2)called"oaone"(O3).It is important to the earth.But now air pollution is destroying it and that has made a very big hole in the ozone layer.Too much harmful radiation(辐射)from the sun passes though the hole and reaches the earth directly.This is very dangerous because it can cause cancer.
     More carbon dioxide (CO2) Carbon dioxide in the air has increased a lot.It mainly comes from burning oil,coal and wood.This has formed a"blanket"around the each.The heat from the sun can't eacape so the temperature is rising.This is called"the greenhouse effect(温室效应)".It causes the level of the ocean to rise and the climate(气候)of the earth to change.
    All these problems are very serious,so we must do something now.
73.Which of the following is right according to the passage?C
A.Cars don't pollute the air.
B.People cut down fewer trees.
C.Factories can pollute the water.
D.We humans have changed our planet a little.
74.What does the underlined word"it"in the passage refer to?B
A.CO2
B.O3
C.O2
D.H2O.
75.What makes the level of the occeans rise?C
A.Pollution.
B.Fewer trees.
C.The greenhouse.
D.Changes in the climate.
76.What is the best title for this passage?A
A.Environment Problems.
B.Hope for the Future.
C.Pollution on the Earth.
D.The Greenhouse Effect.
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