Just like us，trees change a lot as they grow.At one to three years old，young trees learn how to protect themselves.For example，many trees grow thorns to warn animals not to go near. When trees are four years old，they begin to grow very quickly and become strong enough to face challenges later in life.At the age of 15，trees become young adults.They grow more slowly and begin to produce flowers and fruit. It is not until the tree is 20 to 25 years old that it becomes a real adult.The tree reaches its largest size.Not only does the adult tree give us shade，oxygen and natural beauty，it is also a great place for a tree house，or a place for us to nap，read a book，listen to music or sip tea.If the adult tree receives proper care，it will continue to live healthily for many years. Gradually，trees begin to grow older and older and even die.At this time，they still have their important place in nature.When a tree becomes hollow （中空的） or part of it becomes dead，it provides a home to small animals and is a source of food for many other animals. In many ways，the life of a tree is similar to our own life experience.When looking at the life of a tree，we learn that each period of life brings it own form of joy and challenge.Enjoy every minute of it and take care of the trees!（1）According to the writer，we learn when trees are ____ and they learn to protect themselves.A.one to three years oldB.four years oldC.15 years oldD.20 to 25 years old（2）What's the Chinese meaning of the underline word "thorns"？ ____ A.藤B.果C.根D.刺（3）Which of the following about trees is NOT true？ ____ A.n adult tree gives us shade，oxygen and natural beauty.B.Many young trees grow thorns to warn animals.C.Older trees could do nothing for nature.D.An adult tree can make a great place for us to nap.（4）When trees die they will soon ____ .A.be cut down by farmersB.be protected by people who love natureC.be used as a home to small animalsD.be taken away from forests and sold out（5）What is the best title for this passage？ ____ A.The Life of Trees.B.The Love of Nature.C.Trees in Our Life.D.Loving Trees.

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      Trees，are one of the oldest"citizens" of our Earth.They keep our air clean，reduce noise pollution，improve water quality and provide food and building materials.
      Just like us，trees change a lot as they grow.At one to three years old，young trees learn how to protect themselves.For example，many trees grow thorns to warn animals not to go near.
      When trees are four years old，they begin to grow very quickly and become strong enough to face challenges later in life.At the age of 15，trees become young adults.They grow more slowly and begin to produce flowers and fruit.
      It is not until the tree is 20 to 25 years old that it becomes a real adult.The tree reaches its largest size.Not only does the adult tree give us shade，oxygen and natural beauty，it is also a great place for a tree house，or a place for us to nap，read a book，listen to music or sip tea.If the adult tree receives proper care，it will continue to live healthily for many years.
      Gradually，trees begin to grow older and older and even die.At this time，they still have their important place in nature.When a tree becomes hollow （中空的） or part of it becomes dead，it provides a home to small animals and is a source of food for many other animals.
      In many ways，the life of a tree is similar to our own life experience.When looking at the life of a tree，we learn that each period of life brings it own form of joy and challenge.Enjoy every minute of it and take care of the trees!
（1）According to the writer，we learn when trees are  ____ and they learn to protect themselves.
A.one to three years old
B.four years old
C.15 years old
D.20 to 25 years old
（2）What's the Chinese meaning of the underline word "thorns"？ ____
A.藤
B.果
C.根
D.刺
（3）Which of the following about trees is NOT true？ ____
A.n adult tree gives us shade，oxygen and natural beauty.
B.Many young trees grow thorns to warn animals.
C.Older trees could do nothing for nature.
D.An adult tree can make a great place for us to nap.
（4）When trees die they will soon  ____ .
A.be cut down by farmers
B.be protected by people who love nature
C.be used as a home to small animals
D.be taken away from forests and sold out
（5）What is the best title for this passage？ ____
A.The Life of Trees.
B.The Love of Nature.
C.Trees in Our Life.
D.Loving Trees.