In 1620, abouthalftheUSAwascovered(覆盖) byforests. Todaytheforestshavealmostgone. Alotofgoodlandhasgonewiththem, leavingonlysand(沙地). Chinadoesntwanttocopy(抄) theUSAsexample. Wereplantingmoreandmoretrees. WevebuilttheGreatGreenWalloftreesacrossnorthern(北部的) partofourcountry.TheGreatGreenWallis 7,000 kilometreslong, andbetween 400 and 1,700 kilometreswide. Itwillstopthewindfromblowingtheearthaway. Itwillstopthesandfrommovingtowardstherichfarmland(农田) inthesouth. MoreGreatGreenWallsareneeded. Treesmustbegrownallovertheworld. GreatGreenWallswillmaketheworldbetter.
根据短文内容，选择正确答案。
1.In 1620, about ______ theUSAwascoveredbyforests.
A.athirdB.halfC.twothirdsD.afourth
2.Alotofgoodlandhasgonewith ______.
A.sandB.waterC.windD.forests
3.TheGreatGreenWallinChinais ______ long.
A.7,000 kilometersB.1,700 kilometers
C.7,000 metersD.400 kilometers
4.Treesmustbegrownin ______.
A.ChinaB.theUSAC.somecountriesD.everypartoftheworld
5.______ willmaketheworldbetter.
A.TheGreatWallB.Tallbuildings
C.GreatGreenWallsD.Flowersandgrass
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