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题型:阅读理解-七选五 难度:0.65 引用次数:29 题号:11087926

Atoms and molecules in the air move constantly.     1     In high-pressure systems, the molecules inside the system move faster than those that surround it. The opposite occurs in low-pressure systems, where the air inside the low is moving more slowly than in the surrounding area.

Air flows around a high-or low-pressure system in much the same way as water swirls (旋涡) around a hole. In the Northern Hemisphere, air that moves into a high-pressure system flows outward in a clockwise pattern. Air flowing upward in a region of low pressure moves counterclockwise.     2    

Air is more dense (密集的) in a region of high pressure, so the air pushes out toward less dense regions. The air mass begins to warm as it goes down, which prevents the formation of clouds. The presence of clouds indicates that rain may be present in the air.     3     In a region of low pressure, the air rises. As it does, the air mass cools and clouds form from the humidity (湿气) inside the air mass.

    4    Once the droplets are heavy enough, they fall to the ground. When temperatures are warm, rain is the result. If temperatures are low? the result is snow. When water droplets fall through relatively warmer or colder air masses on the journey to Earth, the low- pressure system may bring snow or ice.

Rain associated with low-pressure systems holds true in much of the Northern Hemisphere.     5     So in tropical areas, rain association with highs or lows is less predictable.

A.This movement creates air pressure.
B.So we can predict rain from the clouds.
C.But the air pressure changes little in tropical climates.
D.The higher the air pressure is, the faster the winds blow in and outwards.
E.Humidity in the rising air of a low-pressure system becomes water droplets.
F.This swirling air results in winds around or near the high-and low-pressure boundaries.
G.High-pressure systems have light or no clouds, indicating fair weather without rain.
【知识点】 气候

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