Why do plants grow in some places and not in others? Why does some land have so much growing on it, while other land has almost no plants growing on it at all? To grow, plants need several things. One 题目和参考答案——青夏教育精英家教网—

题目内容

Why do plants grow in some places and not in others? Why does some land have so much growing on it, while other land has almost no plants growing on it at all? To grow, plants need several things. One is warmth. In very cold places almost nothing grows. Plants also need water. In very dry parts of the Earth only a few unusual plants can grow. That’s why dry deserts everywhere are almost not covered by trees or grass. Plants must also have a place in which to put down their roots and grow. They find it difficult to grow on hard land. The town is built on hard land. The plants here have only the soil found between the cracks of the stones to grow in. Another thing plants must have before they can grow is food. What will happen if we try to make things grow on the sandy beach? A few plants, such as beach grass, will grow in sand, but most plants won’t. Even if the weather is warm enough and we water the plants each day, many of them will die because the sand on this beach has almost no food for plants.

1．According to the passage, plants need ______ things to grow well.

A．two B．three C．four D．five

2．What does the underlined word "cracks" mean in the text?

A．缝隙 B．表面 C．夹层 D．底部

3．From the passage, we can know it is _______for plants to grow in dry places.

A．easy B．difficult C．impossible D．important

4．The reason why most plants can’t grow on the sandy beach is that _______.

A．there isn’t enough sunlight B．there is too much water

C．it is too crowded there D．it has little food for plants

5．The passage can most probably be found in a ______book.

A．science B．history C．travel D．math

CABDA

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Today there are 6.4 billion people on the earth. By the year 2050 there may be 12.5 billion . There are a lot of people to feed. We need more and more food.
One way to produce more food is growing stronger plants. For thousands of years, farmers have made plants better. Every season, they pick the best plants for the next season. It works very slowly. Since 1983, scientists have been able to change plants more quickly by changing their genetic（遗传的） material. Foods from plants grown in this way are called genetically modified(改变的) foods, or GM foods.
By changing the genetic material of a plant, it is possible to make new plants. They make plants which are strong against plant diseases. They can also help in our diseases; a kind of rice is being prepared , for example , which stops people becoming blind.
Rich countries produce GM foods because they are easy to grow and bring in more money. Poor countries are interested in them because they help produce more food.
GM plants are not natural. No one knows how good or bad they are,. Making GM foods is only one way of feeding people in 2050. There are strong feelings against them, because they are unnatural. They may feed people , then hurt them or their children later. But both rich and poor countries are interested in their use, and they are not going to go away. In 2050, we may think differently about them.
【小题1】GM foods are made by
A. farmers            B. workers      C. scientists          D plants
【小题2】What are the good things about GM foods ?
A. They make plants strong against diseases.   B. They are unnatural.
C. They can help in human diseases.            D Both A and C.
【小题3】GM foods        .
A. are a quick way to produce food    B. grow in the wild
C. are safe                           D are grown only in rich countries
【小题4】Why do some people not like GM foods?
A. They are not useful.       B. They are not helpful.
C. They are not natural.      D They are not cheap.
【小题5】From the passage we know that      .

A．GM foods will disappear one day in the future

B．GM foods will not disappear in the future

C．People will not be interested in GM foods.

D．People will have to stop using GM foods

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_________．

【小题2】The Venus flytrap grows in_________．

A．most parts of the world	B．some parts of Africa
C．dry parts of the United States	D．wet parts of England

【小题3】From the passage，we learn that_________．

A．all plants can eat people	B．all plants can eat animals
C．some plants can eat people	D．some plants can eat animals

【小题4】The underlined word“presses”probably means________ in Chinese．

【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

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.

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 hair, 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 such things? As we know, most plants get what they need from the sun, the air, and the ground. In some places, the ground is very poor. It does not 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!

1.The Venus flytrap is a kind of _______.

A. food B. animal C. plant D. meat

2.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 meat

D. plants want to protect themselves against animals

3.Where can most plants get what they need?

A. From the people B. From the animals

C. From the soil D. From the sun, the air, and the ground

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 !

1.The Venus flytrap is a kind of_________．

A．plant B．animal C．food D．meat

2.The Venus flytrap grows in_________．

A．most parts of the world B．some parts of Africa

C．dry parts of the United States D．wet parts of England

3.From the passage，we learn that_________．

A．all plants can eat people B．all plants can eat animals

C．some plants can eat people D．some plants can eat animals

4.The underlined word“presses”probably means________ in Chinese．

A．挤压 B．关上 C．打开 D．松开

5.—Why do some plants eat animal meat? —Because_________．

A．plants are dangerous to animals