8.Hundreds of years ago,life was harder than it is today.People didn't have modern machines.There was no modern medicine,either.
  Life today has brought new problems.One of the biggest is pollution.Water pollution has made our rivers and lakes dirty.It kills our fish and pollutes our drinking water.Noise pollution makes us talk louder and become angry more easily.Air pollution is the most serious kind of pollution to all living things in the world.
  Cars,planes and factories all pollute our air every day.Sometimes the polluted air is so thick that it is like a quilt (被状物) over a city.This kind of quilt is called smog.
  Many countries are making rules to fight pollution.Factories must now clean their water before it is thrown away,and they mustn't let dirty smoke go into the air.
  We need to do many other things.We can put waste things in the dustbin and do not throw them on the ground.We can go to work by bus with our friends in the same car.If there are fewer people driving,there will be less pollution.
  Rules are not enough.Every person must help to fight pollution.
51.Hundreds of years ago,life was much harder than it is today becauseC.
A.there were not any modern machines
B.there was no modern medicine
C.both A and B
D.there were not many people
52.What is the biggest problem in today's life?D
A.Water pollution
B.Air pollution
C.Noise
D.Pollution
53.The most serious kind of pollution isB.
A.noise pollution
B.air pollution
C.water pollution
D.A,B and C
54.Factories must clean their waterD.
A.before they are thrown away
B.when they are thrown away
C.after it is thrown away
D.before it is thrown away
55.From the passage we know thatD.
A.a few years ago,there was no smog at all
B.today people don't have to talk to each other in a loud voice
C.we can drink water from the polluted rivers and lakes
D.people are making rules in order to fight pollution.
7.We are warned by our teachers not to waste time because time(26)Awill never return.I think it quite(27)B.What does time look(28)B?Nobody knows,and we can't see it or touch it and no(29)Aof money can buy it.Time is abstract(抽象的),so we have to(30)Babout it.
   Time passes very quickly.Some students say they don't have(31)Ctime to review their lessons.It is(32)Cthey don't know how to make use of their time.They waste it in going to theatres or playing,and(33)Aother useless things.Why do we study everyday?Why do we work?Why do most people(34)Btake buses instead of walking?The answer is very(35)B.We wish to save time because time is(36)B.
   Today we are living in the 21st century.We(37)Atime as life.When a person dies,his life ends.Since life is short,we must(38)Dour time and energy to our study so that we(39)Cbe able to work and live well in the future.Laziness is the(40)Bof time,for it not only brings us(41)C,but also does other(42)Bto us.If it is necessary for us to do our work today,(43)Dwe do it today and not(44)Dit until tomorrow.Remember that time is much more(45)A.

26.A.lostB.passedC.missedD.used
27.A.importantB.trueC.interestingD.usual
28.A.forB.likeC.afterD.over
29.A.amountB.qualityC.quantityD.price
30.A.thinkB.imagineC.examineD.check
31.A.spareB.freeC.enoughD.much
32.A.thatB.whyC.becauseD.certain
33.A.doingB.makingC.takingD.getting
34.A.needn'tB.have toC.had betterD.would rather
35.A.easyB.simpleC.stupidD.interesting
36.A.worthlessB.pricelessC.readyD.little
37.A.look uponB.agreeC.thinkD.believe
38.A.spendB.giveC.setD.devote
39.A.mustB.shouldC.mayD.would
40.A.helperB.thiefC.friendD.teacher
41.A.wealthB.healthC.failureD.illness
42.A.dangerB.harmC.troubleD.difficulty
43.A.helpB.makeC.haveD.let
44.A.keepB.remainC.manageD.leave
45.A.valuableB.expensiveC.worthD.rich
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