完形填空Treesareoneoftheoldestplants

完形填空Trees are one of the oldest plants on the earth. Just like us, trees change a lot1they grow. At one to three years old, young trees learn to2themselves. For example, many tree grow thorns (刺)to tell animals3near. Most young trees have large and deep green leaves to4enough sunlight and turn it into their food and energy. When trees are four years old, they arestrong enough to5the challenge(挑战)in life. At the age of fifteen, they bee young adults and grow more6. They will have their own flowers and fruit. After the trees are twenty to twenty-five years old, they are called real adults because they reach their7. Adults trees give us oxygen and natural beauty. If we8them very well, they will live healthily for many years. As time goes on, trees begin older and older and even9. At this time, they still have their important places in nature and uses for people.10many ways, the life of trees is like our own life experience.1.A.beforeB.whenC.afterD.since2.A.protectB.provideC.preventD.pollute3.A.to goB.to leaveC.not to goD.not to leave4.A.enjoyB.keepC.stayD.catch5.A.getB.receiveC.faceD.wele6.A.fastB.fasterC.slowD.slowly7.A.weightsB.heightsC.stylesD.sizes8.A.look forB.look afterC.look outD.look at9.A.dieB.hurtC.wasteD.throw10.A.OnB.InC.ForD.At