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高中英语编辑
吉林省公主岭市范家屯镇第一中学2019-2020学年高二上学期第二次月考试题(英语)
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    所属学科高中英语
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 A

The ocean is always movingwaves break on the surfacesea levels rise and fall with the tidesand currents flow below the surfaceAlthough it looks as if the water in a wave is moving across the surface of the oceanit is notThe water is actually moving up and downThis is why an object on top of a wave will bob up and downbut not move forward

When a wave reaches the shorehowever, the water does move forwardIt surges(前进)onto the shoreThis is because the “bottom” of the wave drags on the sand and the “top” continues oncrashing onto the shoreThis crashing water is called the surfMost waves are caused by wind blowing across the ocean's surfaceThe size of a wave depends on how fast and how far the wind blows over the surface and on the depth of the waveSmall winds can cause rippleswhile strong winds create large hurricane waves

Along most shorelineswater levels rise and fall twice a dayThese changescalled tidesare caused by the gravitational pull of the Sun and the MoonThe ocean surface liftsor bulges(凸出)in two placeson the side of Earth that faces the Moon and on the side of Earth that faces away from the MoonBoth bulges cause a high tide on nearby shorelinesAt the same time that the high tides occurlow tides occur between the two bulges

Tides are also affected by the pull of the Sunalthough the effect of the Sun is not as great as the effect of the MoonWhen the Moon and Sun are lined up with Earththe combined pull is the strongestcausing the highest high tides and the lowest low tidesThese very high and very low tides are called spring tidesWeaker tidescalled neap tideshappen when the Moon and the Sun are at right angles to EarthHigh tides alternate with low tidesAlong most shorelinesa high tide or low tide occurs about every six hours

21The word “alternate” in the last paragraph means ______

      Aappear suddenly                    Bbob up and down

      Cchange or become quickly       Dhappen or follow one after another

22. The water in the ocean is actually moving ______.

A. left and right    B. forward and backward    C. here and there    D. up and down

23. Most waves are caused by ______.

    A. the sun    B. the air    C. the wind blows    D. fish in the ocean

24The best title for the passage is ______

      AThe Moving Ocean      CTides and Waves

      BOcean and Earth       DWaves and Currents

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