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学科网（北京）股份有限公司学科网（北京）股份有限公司学科网（北京）股份有限公司学科网（北京）股份有限公司学科网（北京）股份有限公司学科网（北京）股份有限公司学科网（北京）股份有限公司学科网（北京）股份有限公司学科网（北京）股份有限公司学科网（北京）股份有限公司参考答案21-25DBAAC26-30BBCCC31-35CBDCA36-40BDDDD41-45BCADA46-50BADDB51-55CADCB56-60DAACC61-65BAEDC66.Atthebeginningofabook.67.Itcontainsusefulinformation.68.Four.69.Whyistheseacrying?70、gently71、leaves72.snowy73.thenicest74.togo75.snowmen76、our77.turn;love78.It'sexcitingtotakeatripinspring.79.or;with80.Making;is81.cool;dry作文：描述地球的重要性的语言：TheEarthisabeautifulplace.Itisourhome.WehaveonlyoneEarth.描述目前地球现状的语言：简单概括问题：However,therearealotofproblemsonEarthnow.WemustdosomethingtoprotecttheEarth.描述具体问题：Peoplecatchalotoffisheveryday.Therearefewerandfewerfishintheseaeachyear.Theyalsoburnthingstomakeenergy.Thismakestheairdirty.Besides,peopleputrubbishintotheseaandundertheground.Thispollutesthelandandkillsanimalsandplants.（Peoplecutdowntoomanytreeseveryday.Manyanimalslosetheirhome.）解决措施:Peoplemuststopdoingthesethings.学科网（北京）股份有限公司Asjuniorhighschoolstudents,wecanbeginwithsomesmallthings.First,wecansavewater.Second,Wecantakeourownshoppingbagstothesupermarket.Third,weshouldusebothsidesofpaper.Finally,wecanwalktoschoolorrideabiketoschool.(Wecanplantmoretrees.Wecanpickuptherubbishontheground.Weshouldprotectwildanimals.Wecaneatupallthefoodontheplate.)我们的决心、号召:It’simportantforustoprotecttheEarth.Let’stakeactionnow!WewillmaketheEarthabetterplace!