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完形填空
Trees are one of the oldest plants on the earth．Just like us, trees change a lot 1 they grow．At one to three years old, young trees learn to 2 themselves．For example, many tree grow thorns(刺)to tell animals 3 near．Most young trees have large and deep green leaves to 4 enough sunlight and turn it into their food and energy．When trees are four years old, they are strong enough to 5 the challenge(挑战)in life．At the age of fifteen, they become young adults and grow more 6 ．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 their 7 ．Adults trees give us oxygen and natural beauty．If we 8 them very well, they will live healthily for many years．As time goes on, trees begin older and older and even 9 ．At this time, they still have their important places in nature and uses for people． 10 many ways, the life of trees is like our own life experience．
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