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.
小题1: | A.before | B.when | C.after | D.since |
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小题2: | A.protect | B.provide | C.prevent | D.pollute |
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小题3: | A.to go | B.to leave | C.not to go | D.not to leave |
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小题4: | A.enjoy | B.keep | C.stay | D.catch |
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小题5: | A.get | B.receive | C.face | D.welcome |
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小题6: | A.fast | B.faster | C.slow | D.slowly |
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小题7: | A.weights | B.heights | C.styles | D.sizes |
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小题8: | A.look for | B.look after | C.look out | D.look at |
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小题9: | A.die | B.hurt | C.waste | D.throw |
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