Without the atmosphere, there would be
no weather, no wind, rain, snow, or clouds. Air is all around us; we live at the
bottom of a great ocean of air. It is invisible, but we can feel it when it
moves. There are miles of all above us, pressing down with great weight on the
earth and everything on it. Because air presses down on us from all directions
at the same time, and because we are able to bear (忍受) this weight, we do not
seem to feel it. But scientists have proved that air has this weight, and that
anything that has weight creates (产生) a force called pressure. As changes in air
pressure take place, they make air move. Air is a gas that
expands (膨胀) when heated, gets lighter, and moves upward. When air is cooled, it
gets heavier, sinks close to the earth’s surface, and flows like water in a
great river. As warm air rises, co A. there is air pressure B. the air is heavy C. air pressure doesn’t remain the same all the time D. air comes up and down
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Without th"的相关试题:
[单项选择]{{B}}C{{/B}}
Without the atmosphere, there would be
no weather, no wind, rain, snow, or clouds. Air is all around us; we live at the
bottom of a great ocean of air. It is invisible, but we can feel it when it
moves. There are miles of all above us, pressing down with great weight on the
earth and everything on it. Because air presses down on us from all directions
at the same time, and because we are able to bear (忍受) this weight, we do not
seem to feel it. But scientists have proved that air has this weight, and that
anything that has weight creates (产生) a force called pressure. As changes in air
pressure take place, they make air move. Air is a gas that
expands (膨胀) when heated, gets lighter, and moves upward. When air is cooled, it
gets heavier, sinks close to the earth’s surface, and flows like water in a
great river. As warm air rises, co A. why we don’t feel air B. why atmosphere is important to us C. why there is air surrounding us D. why there is air pressure
[单项选择] C
Without the atmosphere, there would be
no weather, no wind, rain, snow, or clouds. Air is all around us; we live at the
bottom of a great ocean of air. It is invisible, but we can feel it when it
moves. There are miles of all above us, pressing down with great weight on the
earth and everything on it. Because air presses down on us from all directions
at the same time, and because we are able to bear (忍受) this weight, we do not
seem to feel it. But scientists have proved that air has this weight, and that
anything that has weight creates (产生) a force called pressure. As changes in air
pressure take place, they make air move. Air is a gas that
expands (膨胀) when heated, gets lighter, and moves upward. When air is cooled, it
gets heavier, sinks close to the earth’s surface, and flows like water in a
great river. As warm air rises, cold air r
[单项选择]
Without the atmosphere, there would be no weather, no wind, rain, snow, or clouds. Air is all around us; we live at the bottom of a great ocean of air. It is invisible, but we can feel it when it moves. There are miles of all above us, pressing down with great weight on the earth and everything on it. Because air presses down on us from all directions at the same time, and because we are able to bear (忍受) this weight, we do not seem to feel it. But scientists have proved that air has this weight, and that anything that has weight creates (产生) a force called pressure. As changes in air pressure take place, they make air move.
Air is a gas that expands (膨胀) when heated, gets lighter, and moves upward. When air is cooled, it gets heavier, sinks close to the earth’s surface, and flows like water in a great river. As warm air rises, cold air rashes to take its place. Thus winds originate (起源). The winds that blow high above us are caused by the warmer air running away fr A. why we don’t feel air B. why atmosphere is important to us C. why there is air surrounding us D. why there is air pressure
[填空题] A.here B.where C.mere D.atmosphere
[简答题]The (outmost) layer of the sun’s atmosphere, the corona, is (visibly) as a pinkish halo of light (during) (a) total eclipse.
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