Can trees talk? Yes, but not in words. Scientists have reason to believe that trees do communicate with each other. Not long ago, researchers learned some surprising things. First a willow tree attack 题目和参考答案——青夏教育精英家教网—

题目内容

Communication, of course, doesn’t need to be in words. We can talk to each other by smiling, raising our shoulders and moving our hands. We know that birds and animals use a whole vocabulary of songs, sounds, and movements. Bees dance their signals, flying in certain patterns that tell other bees where to find nectar (花蜜) for honey. So why shouldn’t trees have ways of sending message?

1. It can be concluded from the passage that caterpillars do not feed on leaves that ______.

A．are lying on the ground	B．have an unpleasant taste
C．bees don’t like	D．have an unfamiliar shape

2.According to the passage, the willow tree was able to communicate with other trees by ______.

A．waving its branches	B．giving off a special smell
C．dropping its leaves	D．changing the colour of its trunk

3.According to this passage, bees communicate by ______.

A．making special movement	B．touching one another
C．smelling one another	D．making unusual sound

【答案】

1.B

2.B

3.A

【解析】略

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Can trees talk? Yes--but not in words. Scientists have reasons to believe that trees do communicate with each other. Not long ago, researchers learned some surprising things. First a willow tree（柳树）attacked in the woods by caterpillars（毛毛虫）changed the chemistry of its leaves and made them taste so terrible that the caterpillars got tired of the leaves and stopped eating them. Then even more astonishing, the tree sent out a special vapour--a signal causing its neighbours to change the chemistry of their own leaves and make them less tasty.

　　Communication, of course, doesn't need to be always in words. We can talk to each other by smiling, raising our shoulders and moving our hands. We know that birds and animals use a whole vocabulary of songs, sounds, and movements. Bees dance their signals, flying in certain patterns that tell other bees where to find nectar（花蜜）for honey. So why shouldn't trees have ways of sending messages?

（1）When attacked, a willow tree will protect itself by _______.

[　　]

A. changing its leaves' chemistry

B. changing its leaves' colour

C. talking to caterpillars

D. sending out a special vapour

（2）From the passage we know that caterpillars _______ .

[　　]

A. like willow trees

B. enjoy eating fallen leaves

C. feed on willow tree leaves

D. could communicate with willow trees

（3）Caterpillars will stop eating willow tree leaves which _______ .

[　　]

A. have a chemical change and become tasteless

B. have a pleasant taste

C. are being attacked

D. are communicating

（4）According to the passage, how do willow trees communicate with each other?

[　　]

A. They talk in words.

B. They send out a special vapour.

C. They wave their leaves.

D. They make special sounds.

（5）According to the passage, bees communicate with each other by ______ .

[　　]

A. talking

B. making unusual sounds

C. singing songs

D. flying in certain patterns

There are some places in the world where great cities once stood. There were trees, gardens and grass. But now these cities have gone and the places are like deserts. Scientists began to study this land to find out what happened. Many of them believed the land died when the trees were cut down.
Trees help other plants grow and help hold the soil in place. They keep the soil from blowing away. The leaves of trees on the ground keep rainwater from running off. Trees near farms protect growing plants from strong winds.
Once there were hundreds of farms in the southwestern United States. Then the farms turned into fields of dry dust. Trees might have saved these farms. But few trees grow in the dry southwest now.
Now we try to save trees. In many places, when a tree is cut down , a new tree is planted in its place . We do not want the land to die.
【小题1】Places where great cities once stood are now like ______ .

【小题2】What can trees do according to the passage ?

A．Trees can keep other plants green

B．Trees can help other plants grow .

C．Trees can help the land grow .

D．Trees can keep other plants in place .

【小题3】Which is true ?

A．Trees let the rainwater run off .

B．All the farms in the United States have turned into deserts .

C．There aren’t any trees in the dry southwest now .

D．Land will die if there are no trees .

【小题4】The main idea of this passage is _________ .

A．that farms are better than cities

B．how farms turned into deserts

C．that trees are important to the land

D．how people save trees

【小题5】From the passage we know that _______ .

A．trees can blow soil away

B．man should protect the land

C．trees grow only in deserts

D．trees die easily

Can trees talk? Yes, but not in words. Scientists have reason to believe that trees do communicate (交际) with each other. Not long ago, researchers learned some surprising things. First a willow tree attacked in the woods by caterpillars (毛虫) changed the chemistry of its leaves and made them taste so terrible that they got tired of the leaves and stopped eating them. Then even more astonishing, the tree sent out a special smell---a signal (信号) causing its neighbors to change the chemistry of their own leaves and make them less tasty.
Communication, of course, doesn’t need to be in words. We can talk to each other by smiling, raising our shoulders and moving our hands. We know that birds and animals use a whole vocabulary of songs, sounds, and movements. Bees dance their signals, flying in certain patterns that tell other bees where to find nectar (花蜜) for honey. So why shouldn’t trees have ways of sending message?
【小题1】It can be concluded from the passage that caterpillars do not feed on leaves that ______.

A．are lying on the ground	B．have an unpleasant taste
C．bees don’t like	D．have an unfamiliar shape

【小题2】The willow tree described in the passage protected itself by ______.

A．growing more branches	B．communicating with birds and bees
C．changing its leaf chemistry	D．shaking caterpillars off

【小题3】According to the passage, the willow tree was able to communicate with other trees by ______.

A．waving its branches	B．giving off a special smell
C．dropping its leaves	D．changing the colour of its trunk

【小题4】According to this passage, bees communicate by ______.

A．making special movement	B．Telling one another
C．smelling one another	D．making unusual sound

Can trees talk? Yes—but not in words. Scientists have reasons to believe that trees do communicate with each other. Not long ago, researchers learned some surprising things. First a willow tree(柳树) attacked in the woods by caterpillars(毛毛虫) changed the chemistry of its leaves and made them taste so terrible that the caterpillars got tired of the leaves and stopped eating them. The even more astonishing, the tree sent out a special vapor — a signal causing its neighbors to change the chemistry of their own leaves and make them less tasty.
Communication, of course, doesn’t need to be always in words. We can talk to each other by smiling, raising our shoulders and moving our hands. We know that birds and animals use a whole vocabulary of songs, sounds, and movements. Bees dance their signals, flying in certain patterns that tell other bees where to find nectar(花蜜) for honey. So why shouldn’t trees have ways of sending messages?
【小题1】Why did Caterpillars stop eating the leaves of a willow tree? (No more than 15 words)
【小题2】According to the passage, how do bees communicate with each other? (No more than 5 words)
【小题3】What is the main idea of this passage? (No more than 5 words)

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