[单项选择]The atmosphere is all the air surrounding the earth. Without it, we would be forced to seek shelter from the sun, as there would be no atmosphere to protect us from the sun’s deadly rays.
Large and powerful, the atmosphere consists of an ocean of gases hundreds of miles high. It presses down on our bodies with a force of more than fourteen pounds per square inch. The narrow column of air which rests upon our shoulders weighs almost 2000 pounds. But our bodies are built in such a way that this weight does not crush(压碎)us.
In this huge ocean of air there is more energy than in all the coal, oil, and gas we have on earth. Electrical energy is collected in the atmosphere as water is collected and stored in a dam. The existence of electricity in the air has been known for centuries. But a thorough study of electricity in the atmosphere was not possible until the development of radio and radar.
One scientist, Dr. Sydney Chapman, has tried to explain the electric field wh
A. the total amount of oxygen over the earth
B. mixture of gases surrounding the earth
C. a source of storms
D. the diffusion of waste gas

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[单项选择]The atmosphere is all the air surrounding the earth. Without it, we would be forced to seek shelter from the sun, as there would be no atmosphere to protect us from the sun’s deadly rays.
Large and powerful, the atmosphere consists of an ocean of gases hundreds of miles high. It presses down on our bodies with a force of more than fourteen pounds per square inch. The narrow column of air which rests upon our shoulders weighs almost 2000 pounds. But our bodies are built in such a way that this weight does not crush(压碎)us.
In this huge ocean of air there is more energy than in all the coal, oil, and gas we have on earth. Electrical energy is collected in the atmosphere as water is collected and stored in a dam. The existence of electricity in the air has been known for centuries. But a thorough study of electricity in the atmosphere was not possible until the development of radio and radar.
One scientist, Dr. Sydney Chapman, has tried to explain the electric field wh
A. the atmosphere is important to none.
B. a great deal of damage from the sun’s deadly rays would be done to us, if there were no atmosphere.
C. the atmosphere, as the author described, is the roof under which man can live safely on Earth.
D. electricity in the atmosphere is being studied from every aspect.

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[填空题]surrounding

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[单项选择]Air, or （　） is called atmosphere, surrounds the whole earth.
A. it
B. that
C. which
D. what

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[单项选择]{{B}}Text 5{{/B}}

The air surrounding us is important to everyone. Without air, we could not exist. Everyone understands that. But air is necessary in many other ways — ways that are not always so obvious or widely known.
If we did not have air, there would be no sound. Sound travels through air. Where there is no air, there is no sound. Without air there would be no fire. There would be no automobiles, since motors need air in order to operate.
Without air, there would be no wind or clouds. The night time would be very cold and the days very hot. We would be forced to seek shelter from the sun, as there would be no atmosphere to protect us from the sun’s deadly rays.
In this huge ocean of air surrounding the earth, there is more energy than in all the coal, oil and gas we have on the earth. Electrical energy is collected in the at
A. air is important to human being
B. air is important to the earth
C. air is necessary in many other ways
D. air is necessary to the animals

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[单项选择]I hope all the precautions against air pollution, （） suggested by the local government, will be seriously considered here.
A. while
B. since
C. after
D. as

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[单项选择]
Passage One

For more than 40 years, Earth has been sending out distress signals. At first they were subtle, like the thin shells of bald-eagle eggs that cracked because they were laced (使混合) with DDT. Then the signs were unmistakable, like the covering of smoke over the Amazon rain forest, where farmers and ranchers (牧场主人) set fire to clear land. Finally, as the new millennium drew near, it was obvious that Earth’s pain had become humanity’s pain. The collapse of the North Atlantic cod (鳕鱼) fishery put 30,000 Canadians out of work and ruined the economies of 700 communities. In 1998, deforestation worsened China’s floods, which killed 3,600 people and left 14 million homeless. Population pressures and overcrowding raised the toll from 1999’s rains in Latin America, which killed more than 30,000 people and created armies of environmental ref
A. Overpopulation.
B. Deforestation.
C. Pollution.
D. Fuel depletion.

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