阅读理解

Theworlditselfisbecomingmuchsmallerbyusingmoderntrafficandmoderncommunicationmeans(通讯设备).Lifetodayismucheasierthanitwashundredsofyearsago,butithasbroughtnewproblems.Oneofthebiggestproblemsispollution.Topollutemeanstomakethingsdirty.Pollutioncomesinmanyways.Weseeit,smellit,drinkitandevenhearit.

Manhasbeenpollutingtheearth.Themorepeople,themorepollution.Manyyearsago,theproblemwasnotsoseriousbecausetherewerenotsomanypeople.Whenthelandwasuseduportheriverwasdirtyinoneplace,manmovedtoanotherplace.Butthisisnotlongertrue.Manisnowslowlypollutingthewholeworld.

Airpollutionisstillthemostserious.It'sbadforalllivingthingsintheworld,butitisnottheonlyonekindofpollution.Waterpollutionkillsourfishandpollutesourdrinkingwater.Noisepollutionmakesusangrymoreeasily.

Manycountriesaremakingrulestofightpollution.Theystoppeoplefromburningcoalinhousesandfactoriesinthecity,andfromputtingdirtysmokeintotheair.PollutionbySO2isnowthemostdangerouskindofairpollution.Itiscaused(引起)byheavytraffic.Wearesurethatiftherearefewerpeopledriving,therewillbelessairpollution.

Theearthisourhome.Wemusttakecareofit.Thatmeanskeepingtheland,waterandairclean.Andwemusttakecareoftheriseinpollutionatthesametime.

1．________,ourworldisbecomingmuchsmaller.

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A．Becauseoftheriseinpollution

B．Thankstosciencedevelopment

C．Becausetheearthisbeingpolluteddayandnight

D．Becausetheearthisblownawaybythewindeveryyear

2．Hundredsofyearsago,lifewas________itistoday.

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A．mucheasierthanB．aseasyasC．muchharderthanD．ashardas3．Pollutioncomesinmanyways.Wecanevenhearit.Here“It”means________.

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A．rubbishB．noisepollutionC．airpollutionD．waterpollution4．Airpollutionisthemostseriouskindofpollutionbecause________.

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A．itmakesmuchnoise

B．itmakesusangrymoreeasily

C．itmakeourriversandlakesdirty

D．it'sbadforallliv