题目内容

Plants can communicate with ________．But we don't know how．


  1. A.
    another
  2. B.
    the other
  3. C.
    others
  4. D.
    one another
C
one another(＝each other)意思是“互相”，所以正确答案是C．
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相关题目
All living things on the earth need other living things to live. Nothing lives alone. Most animals must live in a group, and even a plant grows close together with others of the same kind. Sometimes one living thing kills another, one eats and the other is eaten. Each kind of life eats another kind of life in order to live, and together they form a food chain(食物链).Some food chains are simple, while others are not. But all food chains begin with the sun, and all food chains become broken up if one of the links disappears.
All life needs sunlight to live on. But only plants can use sunlight directly. Plants are“factories”.They make food from sunlight, water and things in the soil and air.
Plants feed all other living things. Animals can only use the sun’s energy after it has been changed into food by plants. Some animals feed directly on plants, others eat smaller animals. Meat-eating animals are only eating plants indirectly.
What about human beings? We are members of many food chains. We eat wheat, rice, vegetables, fruits and so on. We also eat meat and drink milk. But men often break up the food chains. They kill wild animals. They also make rivers, lakes and seas dirty. When these rivers, lakes and seas are polluted, the fish in them cannot be eaten. If men eat the fish, they will get strange diseases.
Each form of life is linked to all others. Breaking the links puts all life in danger. 
【小题1】How does every living thing on the earth live?
A. Each plant can live alone.
B. Each animal can live alone.
C. Every living thing on the earth cannot live without others.
【小题2】Which living things can use the sun’s energy directly?
A. Animals      B. Plants         C. All living things
【小题3】Who often break up the food chains?
A. Human beings
B. Animals
C. Plant and animals
【小题4】 Which of the following do you think is the best title of this passage?
A. Animals         B. Plants       C. Food Chains    
【小题5】Where can you probably find this passage?
A. In a news report.
B. In your textbook.
C. In a business magazine.

Can plants eat people? Probably not，but there are many plants that eat meat．Some of them are big．And they can eat small animals．One famous meat-eating plant is the Venus flytrap(捕蝇草)．
The Venus flytrap is a very strange plant．It grows in dry parts of the United States．Its leaves are like the pages of a book．They can open and close very quickly．Inside the leaves，there are three small hairs．If a fly touches one of the hairs，the leaf closes quickly．The fly cannot get out．In about half an hour，the leaf presses the fly until it is dead．Then，the plant covers the fly．Slowly，the plant eats the fly．
Why do plants do it? Most plants get what they need from the sun，the air，and the ground．In some places，the ground is very poor．It doesn’t have all these important things，
especially nitrogen(氮)．Animal meat has a lot of nitrogen， so some plants eat meat to get what they need．Let’s hope that some of the bigger plants don’t get the same idea !
【小题1】The Venus flytrap is a kind of_________．

A．plantB．animalC．foodD．meat
【小题2】The Venus flytrap grows in_________．
A．most parts of the worldB．some parts of Africa
C．dry parts of the United StatesD．wet parts of England
【小题3】From the passage，we learn that_________．
A．all plants can eat peopleB．all plants can eat animals
C．some plants can eat peopleD．some plants can eat animals
【小题4】The underlined word“presses”probably means________ in Chinese．
A．挤压B．关上C．打开D．松开
【小题5】—Why do some plants eat animal meat? —Because_________．
A．plants are dangerous to animals
B．animals are dangerous to plants
C．plants want to get what they need from animal me
D．plants want to protect themselves against animals

When you watch TV programs about wild animals, it is surprising to see how an antelope (羚羊) can run away from a strong lion. In the wilderness, everyone has his own way to protect himself. Even plants have their own ways to fight off enemies.

    Over millions of years, plants have developed their own defense system (防卫系统). Chemicals(化学物) are fantastically used by plants to survive . By making their leaves, flowers, roots and fruits poisonous (有毒的) to enemies, plants can fight back.

    One such plant is the Golden Wattle tree. The British scientist David Cameron has found when an animal eats the tree's leaves, the amount (数量) of poison increases in the other leaves. "It's like the injured leaves telephoning the others to fight together against the enemy", he said.

    The tree also sends defense messages to neighboring plants by giving out a special smell. Golden Wattle trees in the nearby 45 meters will get the message and produce more poison within 10 minutes. Now, if an enemy eats too many of the trees' leaves, he will die.

    Every kind of plant or tree is good at producing a special set of chemicals. Herbivores, like rabbits, can safely eat the leaves of one tree, but they may be poisoned by its neighbor.

    In this way, plants have not only developed their own defense system, but also shared it with others. This makes it impossible for a single animal to destroy even a small area of forest.

1.From the first 2 paragraphs, we can learn that_______.

A. plants can do nothing against their enemies

B. chemicals are quite useful for plants to survive

C. an antelope can always run away from a strong lion

D. leaves, roots, flowers and fruits of plants are poisonous

2.The underlined word "herbivores" in the 5th paragraph probably means animals which_______.

A. produce poison                            B. live on small animals

C. like to eat rabbits                 D. feed on plants or grass

3.The last paragraph of the passage suggests that this kind of defense system is_______.

A. bad for animals                             B. good for forests

C. helpful to some animals    D. harmful to forests

4.The passage is mainly about_____________________.

A. the examples of protecting forests

B.the balance between animals and plants

C. the ways of plants fighting against enemies

D. the relationship between lions and antelopes

 

1 

阅读下面的短文，根据短文中的信息完成文后的表格（每空一词）

Do you know how to keep fish at home?

The fish need room(空间). They must not be crowded（拥挤）. Fish need oxygen(氧气). Fish get it from water in the tank. There must be enough water for all fish in the tank. So the size of the tank is important..

In the tank many people put small plants. They give oxygen to the water. Plants help in other ways, too. Fish can nibble(轻咬)on the plants. They hide in the plants and sleep, lay eggs there.

Both the plants and fish need light. You can put it near a window. It will get light there. But remember: a window may let cold air in. The cold can kill(杀死) your fish. Too hot water can kill your fish, too.

The fish need food and you should feed them every day. Giving them too much food is bad. It will make the water dirty. However, the fish should get just enough food. They should finish the food in 10 minutes. No extra(多余) is left. When this happens, the amount(数量)of food is right.

How to keep fish at home

Advice

_______1_____

1.The ___2___ of the tank is important

Fish need enough room because they will be crowded in a small tank. They need __3____ water because they get oxygen from it.

2.You can put small plants in the tank

Plants can give oxygen to the water, they also give a ____4___ to fish to hide, sleep and lay eggs

3.You can put the tank ___5___ a window, but don’t let cold air in.

Light is __6____ for fish and plants. It can get in through the window. But you shouldn’t ___7__ cold air can also get in and cold air will kill your fish.

4.Feed the fish every day but not too ____8__

Too much food makes water ____9___ easily. When fish can finish ____10___ food in 10 minutes, the amount of food is right.

 

The population of the Earth is growing faster. It is important that we look after the Earth. We need it! The Earth gives us a lot of things. We also give the Earth a lot, but some of the things are not good.

In nature, when something dies, other animals and plants get food from it. Every animal or plant gives food for other animals or plants. However, animals can’t get food from many of the things that we ‘give’ the Earth. Animals and plants can’t eat metal, plastic and glass. These things will stay in the ground for many, many years.

         Some rubbish is very dangerous for plants and animals. In some places, many animals live together. One animal makes food for many more animals. If we put rubbish and chemicals in the water, the plankton(浮游生物) can die. If there isn’t any plankton, many animals have nothing to eat.

         So what can we do? Don’t leave any rubbish in the countryside! Don’t make so much rubbish!

1.The Earth gives us ___________.

         A. food            B. rubbish                        C. chemicals                   D. pollution

2.When something dies in nature, _________.

         A. water and grass are polluted                      B. plastic and wood become food

         C. other animals and plants get food             D. metal and glass stay in the ground

3.We must _______ to look after the Earth.

         A. put metal in the ground                               B. use more wood

         C. keep frogs in the water                                   D. make less rubbish

 

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