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in the past. They are still changing it today.
The Colorado River slowly cut through stone to make the Grand Canyon.
Long ago, ice sheets cut Yosemite Valley and glaciers (冰川) were moving in Alaska.
Rains and storms hit the land from time to time. Fires sometimes burn down forests and destroy the homes
of wide animals. This happened in Yellowstone Park in 1998.
Dead volcanic (火山的) mountains such as Haleakala on Moui and Crater Lake in Oregon are beautiful to
look at. There are also several active volcanoes in the US, especially along the Pacific Coast. There are also
many earthquakes in this area. Scientists can do nothing to control earthquakes or volcanoes. This was shown
clearly on May 18, 1980. At 8: 32 that morning, Mount St. Helens in Washington State erupted (爆发). The top
of the mountain was blown off.
Over 60 people-campers, scientists, journalists, and forest workers were killed. Hundreds of square miles
of forests were knocked down. In towns over 100 miles away, day suddenly became night. An ash cloud hid
the sun for many hours. Town and fields in Washington, Oregon, and Idaho were covered with dirty grey ash.
Scientists knew that Mount St. Helens could erupt soon but no one could say when. And no one expected
the terrible strength of the eruption. Many people were surprised and weren't ready. Harry R. Truman, 84,
owned a small hotel in Mount St. Helens. Scientists had asked him to leave because the volcano was becoming
dangerous.
Harry Truman would not leave his home. Now it is covered with many feet of dirty ash. A small cross
stands above the place where Harry probably died. Perhaps it is better that he did not see what happened to
Mount St Helens, the once beautiful lake, and the forests.
But slowly, life is returning to the dead area around the mountain. Grass and small plant are beginning to
grow again. Deer and birds have been seen in the area. The land will never be the same as it once was. Perhaps
Mount St. Helens will erupt again but this is all part of nature's pattern of change, and man has little power to
control it.
( )1. The Colorado River slowly cut through stone to make the Grand Canyon.
( )2. Long ago, ice sheets made Yosemite Valley and the Great Lakes, and glaciers are not moving in Alaska.
( )3. Scientists knew exactly when Mount St. Helens would erupt.
( )4. Harry was finally persuaded to leave his home.
( )5. Now the land is not the same as it once was.
Every thing living on earth--each plant and animal--needs other living things. Nothing lives alone. Most animals must live in a group, and even a tree or a plant grows close together with others of the same kind. Sometimes one living thing hunts 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. Some food chains are simple, others are complicated. But all have. two things in common--all food chains began with the sun, and all food chains become broken up if one of the links disappears.
All life depends on energy from sunlight. Only plants can use this energy directly. Their leaves are little factories that use sunlight to make food from water and things in the soil and air.
Plants in turn feted 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, fruit and so on. We also eat meat and drink milk. This means the sun's energy passes through plants to animals before it reaches us.
Nature is a great thing. Any food chain always produces enough for each of its members if it is left alone. When there isn't enough food for any link in the chain, some of its members die off. So the balance is always kept.
But men often break up the food chain and do great harm net only to one plant or animal, but also to all the links in the chain. People make seas and rivers dirty. They destroy whole forests and kill many kinds of wild animals birds. When a river becomes dirty, the fish cannot be eaten. Men eat the fish and get strange diseases. In some places men have no fish to eat any more because the fish have died off. Each form of life is linked to all others. Breaking, the links puts all life in danger.
(1) How does everything living on earth live?
[ ]
A．Each plant can live alone.
B．Each animal can live alone.
C．Everything living on earth cannot live without needing other living things.
D．If living things want to live they must kill each other.
(2) How do all food chains break? All food chains are broken if ________.
[ ]
A．one kind of animal is eaten up
B．one kind of plant is destroyed
C．one kind of animal eats another
D．one of the links is destroyed
(3) How is food for plants made? Food for plants is made ________.
[ ]
A．from water
B．from the air in the sky
C．from the soil
D．from water and things in the soil and air
(4) Which living things can use energy directly?
[ ]
(5) Why is all life in danger? Because ________ break up the food chains.
[ ]
Every thing living on earth--each plant and animal--needs other living things. Nothing lives alone. Most animals must live in a group, and even a tree or a plant grows close together with others of the same kind. Sometimes one living thing hunts 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. Some food chains are simple, others are complicated. But all have. two things in common--all food chains began with the sun, and all food chains become broken up if one of the links disappears.
All life depends on energy from sunlight. Only plants can use this energy directly. Their leaves are little factories that use sunlight to make food from water and things in the soil and air.
Plants in turn feted 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, fruit and so on. We also eat meat and drink milk. This means the sun's energy passes through plants to animals before it reaches us.
Nature is a great thing. Any food chain always produces enough for each of its members if it is left alone. When there isn't enough food for any link in the chain, some of its members die off. So the balance is always kept.
But men often break up the food chain and do great harm net only to one plant or animal, but also to all the links in the chain. People make seas and rivers dirty. They destroy whole forests and kill many kinds of wild animals birds. When a river becomes dirty, the fish cannot be eaten. Men eat the fish and get strange diseases. In some places men have no fish to eat any more because the fish have died off. Each form of life is linked to all others. Breaking, the links puts all life in danger.
(1) How does everything living on earth live?
[ ]
A．Each plant can live alone.
B．Each animal can live alone.
C．Everything living on earth cannot live without needing other living things.
D．If living things want to live they must kill each other.
(2) How do all food chains break? All food chains are broken if ________.
[ ]
A．one kind of animal is eaten up
B．one kind of plant is destroyed
C．one kind of animal eats another
D．one of the links is destroyed
(3) How is food for plants made? Food for plants is made ________.
[ ]
A．from water
B．from the air in the sky
C．from the soil
D．from water and things in the soil and air
(4) Which living things can use energy directly?
[ ]
(5) Why is all life in danger? Because ________ break up the food chains.
[ ]
C
1970 was World Conservation（自然保护）Year. The United Nations wanted everyone to know that the world is in danger. They hoped that people would act quickly in order to conserve nature（大自然）. Here is one example of the problem. At one time there were 1,300 different plants, trees and flowers in Holland, but now only 866 remain. The others have been destroyed by modern man. It is said that there are tens of thousands of kinds of animals in the world, but now many have died out（绝种）. We are changing the earth, the air and water, and everything that grows and lives . We can't live without these things. If we continue like this, we shall destroy ourselves.
What will happen in the future？Perhaps it is more important to ask“What must we do now？”The people who will be living in the world of tomorrow are the young of today. A lot of them know that conservation is necessary. Many are helping to save our world. They plant trees, build bridges across rivers and so on. In a small town in the United States a large group of girls cleaned the banks of 11 kilometres of their river. Young people may hear about conservation through a record called“No one's going to change our world.”It was made by the Beatles, Cliff Richard and other singers. The money from it will help to conserve wild animals.
65、“No one's going to change our world”was .
A、an important book published in 1970
B、an idea that nobody would accept（接受）
C、a record calling on people to conserve nature
D、a newspaper report in 1970
66、What's the most important thing for us to do to save our world？
A、We should know what will happen in the future.
B、We should plant more trees and flowers.
C、We should clean the banks of our rivers.
D、We must do what we must do to save our world.
67、What's the main idea of the passage？
A、1970 was World Conservation Year.
B、The United Nations wanted everyone to know that the world is in danger.
C、Conservation is necessary.
D、Young people are helping to save our world.
1970 was World Conservation（自然保护）Year. The United Nations wanted everyone to know that the world is in danger. They hoped that people would act quickly in order to conserve nature（大自然）. Here is one example of the problem. At one time there were 1,300 different plants, trees and flowers in Holland, but now only 866 remain. The others have been destroyed by modern man. It is said that there are tens of thousands of kinds of animals in the world, but now many have died out（绝种）. We are changing the earth, the air and water, and everything that grows and lives . We can't live without these things. If we continue like this, we shall destroy ourselves.
What will happen in the future？Perhaps it is more important to ask“What must we do now？”The people who will be living in the world of tomorrow are the young of today. A lot of them know that conservation is necessary. Many are helping to save our world. They plant trees, build bridges across rivers and so on. In a small town in the United States a large group of girls cleaned the banks of 11 kilometres of their river. Young people may hear about conservation through a record called“No one's going to change our world.”It was made by the Beatles, Cliff Richard and other singers. The money from it will help to conserve wild animals.
1、“No one's going to change our world”was .
A、an important book published in 1970
B、an idea that nobody would accept（接受）
C、a record calling on people to conserve nature
D、a newspaper report in 1970
2、What's the most important thing for us to do to save our world？
A、We should know what will happen in the future.
B、We should plant more trees and flowers.
C、We should clean the banks of our rivers.
D、We must do what we must do to save our world.
3、What's the main idea of the passage？
A、1970 was World Conservation Year.
B、The United Nations wanted everyone to know that the world is in danger.
C、Conservation is necessary.
D、Young people are helping to save our world.
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