Inthe13thcentury(世纪)thefamousItaliantravellerMarcoPolotravelledalongwaytoChina.DuringhisstayinChinahesawmanywonderfulthings.OneofthethingshediscoveredwasthattheChineseusedpapermoney.Inwesterncountriespeopledidnotusepapermoneyuntilthe15thcentury.HoweverpeopleinChinabegantousepapermoneyinthe7thcentury(世纪).

AChinesemancalledCaiLuninvented(发明)paperalmost2000yearsago.Hemadeitfromwood.Hetookthewoodfromtreesandmadeitintopaper.Hethenputthesepiecesofpapertogetherandmadethemintoabook.Nowpaperstillcomesfromtrees.Weusealotofpapereveryday.Ifwekeeponwasting（浪费）somuchpapertherewillnotbeanytreesleftontheearth.Iftherearenotreestherewillbenopaper.Everydaypeoplethrowawayabout2800tons(吨)ofpaperinourcity.Ittakes17treestomakeonetonofpaper.Thismeansthatwearecuttingnearly48000treeseveryday.Sinceittakesmorethan10yearsforatreetogrowwemuststartusinglesspapernow.Ifwedon'twewillnothaveenoughtimetogrowmoretreestotaketheplaceofthoseweuseforpaper.

Sohowcanwesavepaper?Wecanusebothsidesofeverypieceofpaperespeciallywhenwearemakingnotes.Wecanchoosedrinksinbottlesinsteadofthoseinpaperpackets.Wecanalsousecottonhandkerchiefs(手帕)andnotpaperones.Whenwegoshoppingwecanusefewerpaperbags.Iftheshopassistantgivesusapaperbagwecansaveitandreuseitlater.

Everyonecanhelptosavepaper.Ifweallthinkcarefullywecanhelpprotect(保护)trees.Butweshoulddoitnowbeforeitistoolate.

1.WhenhewasinChinaMarcoPolo_________.

A.discoveredCaiLuninventedpaperB.learnedtomakepaper

C.sawmanywonderfulthingsD.readalotofbooks

2.Peopleinwesterncountriesfirstusedpapermoneyinthe______century.

A.17thB.15thC.13thD.7th

3.About_____tonsofpaperisthrownawayeverydayinourcity.

A.1700B.2000C.2800D.48000

4.WhichofthefollowingisNOTthewayofsavingpaper?

A.Tousebothsidesofeverypieceofpaper.

B.Tousethepaperbagsfromshopsmorethanonce.

C.Tousecottonhandkerchiefsinsteadofpaperones.

D.Togrowmoretrees.

5.Whichisthebestti