题目内容
阅读理解
We believe Earth is only about nine degrees warmer than it was at the coldest time of the last Ice Age about 18000 years ago. But a warming up of just a few degrees more would cause more melting of the glaciers(冰川) of the world. That would put more water into the oceans and raise the sea level. Some cities on our sea coasts could end up under water. And there likely would be big changes in our climate. You can see why we want all the information we can get about our temperature.
Some scientists think they might be able to tell us more by taking the Pacific Ocean's temperature. Unfortunately, you can't discover the ocean's average temperature just by dipping a thermometer in it. There are too many temperature changes, currents, and storms in the oceans. So these scientists have found a clever way to discover the average temperature of a whole ocean. That's the idea of the big experiment. Sound travels in water much better than in air. And in water the speed of sound changes depending on the temperature. So if we can get a sound to travel across an ocean and measure its speed we can take the average temperature of the whole ocean.
Of course, one measurement won't tell much. What we want to know is whether the ocean is getting warmer. If it is, the speed of the sounds will increase and the time to travel through the ocean will get shorter. By making that same measurement, day after day and year after year, we will find out. Ten years from now we should get a better answer to the question of how fast Earth is warming up.
1.About 18 000 years ago, the earth was ________ than now.
[ ]
2.According to the first paragraph, which of the following is true?
[ ]
A.If more and more water poured into the oceans and the sea level was raised higher and higher, more and more land would go down under the water.
B.If more glaciers melted, man could get more fresh water.
C.Why the scientists are anxious to get the information about the temperature changes is unknown to us.
D.If more glaciers melted the continents would go to the bottom of the oceans.
3.The scientists do their best to discover the Pacific Ocean's average temperature changes ________.
[ ]
A.so that they can estimate the speed of air temperature change
B.because there are too many temperature changes in the Pacific
C.because they want to build the Pacific into a huge lab
D.so that they can prevent the glaciers from melting
4.________ the water temperature is, ________ sound travels in it.
[ ]
A.The higher; the more slowly
B.The warmer; the faster
C.The lower; the more slowly
D.The colder; the faster
5.The scientists give us a better answer to the question of how fast the earth is warming up by measuring the sound speed in the Pacific ________.
[ ]
A.day after day for one year
B.only once
C.day after day for ten years
D.once a year for ten years
阅读理解
New York , May 25?
Millions of volunteers (志愿者)joined in a long chain spreading 4 125 miles across the world's richest nation Sunday and burst into songs , reaching the highest
development in the Hands Across America road to raise
50 million for the nation's homeless and hungry.
The chain began with a 6-year-old homeless girl named Amy in New York's Buttery Park. It spread across 16 states and Washington, D.C. where it crossed the White House to the Queen Mary's port in California. The last people in the line were Bill and Mary Jones and their five small children, who lived in a family shelter (收容所) for the homeless in Venice, California.
The chain was not unbroken some gaps were planned for safety, others opened where there were not enough people to cover the ground. But along most of the route, the healthy joined the sick, beautiful film stars , homeless beggars , wealthy artists , poor children and President and Mrs Regan all took places in the long line.
1.What is the main idea of the passage?
[ ]
A.Millions of volunteers support the poor.
B.The longest line is waiting for support.
C.The homeless and poor need help.
D.The richest nation faces the problem.
2.The underlined word “raise” in the first paragraph means _______.
[ ]
|
A.try to lift |
B.manage to collect |
|
C.bring up |
D.join up |
3.From the article, we know that the volunteers were made up of ________.
[ ]
A.both the homeless and the poor
B.the government officials, including President Regan
C.people in every field
D.people of 16 states except Amy
4.What do you think of the people in the chain spreading 4 125 miles?
[ ]
|
A.They were hand in hand. |
B.They were in good order. |
|
C.They were troublesome. |
D.They were planned for safety. |
5.Although the United States is a developed country, ________.
[ ]
A.there is still a rebellion sometimes.
B.there is still many people waiting for jobs
C.there are still some family shelters
D.there are still many social problems to be solved.
阅读理解
New York , May 25?
Millions of volunteers (志愿者)joined in a long chain spreading 4 125 miles across the world's richest nation Sunday and burst into songs , reaching the highest
development in the Hands Across America road to raise
50 million for the nation's homeless and hungry.
The chain began with a 6-year-old homeless girl named Amy in New York's Buttery Park. It spread across 16 states and Washington, D.C. where it crossed the White House to the Queen Mary's port in California. The last people in the line were Bill and Mary Jones and their five small children, who lived in a family shelter (收容所) for the homeless in Venice, California.
The chain was not unbroken some gaps were planned for safety, others opened where there were not enough people to cover the ground. But along most of the route, the healthy joined the sick, beautiful film stars , homeless beggars , wealthy artists , poor children and President and Mrs Regan all took places in the long line.
1.What is the main idea of the passage?
[ ]
A.Millions of volunteers support the poor.
B.The longest line is waiting for support.
C.The homeless and poor need help.
D.The richest nation faces the problem.
2.The underlined word “raise” in the first paragraph means _______.
[ ]
|
A.try to lift |
B.manage to collect |
|
C.bring up |
D.join up |
3.From the article, we know that the volunteers were made up of ________.
[ ]
A.both the homeless and the poor
B.the government officials, including President Regan
C.people in every field
D.people of 16 states except Amy
4.What do you think of the people in the chain spreading 4 125 miles?
[ ]
|
A.They were hand in hand. |
B.They were in good order. |
|
C.They were troublesome. |
D.They were planned for safety. |
5.Although the United States is a developed country, ________.
[ ]
A.there is still a rebellion sometimes.
B.there is still many people waiting for jobs
C.there are still some family shelters
D.there are still many social problems to be solved.
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