题目内容
Many trees should be planted on the mountains．
A．thousand B．thousand of C．thousands D．thousands of
D
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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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