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    精英家教网 > 初中英语 > 题目详情
    As we all know, the ocean moves. But waves breaking on the beach make the ocean fun. When you stand on the shore and look at the waves, it seems like the water is moving towards you. But the water is not really moving forward. The moving you see is wave energy. And wave energy comes from the wind.
    Let’s think about how this works. As wave energy passes through the water, the energy makes particles （粒子） of water move up and down. Just give you an example of a wave passing under a basketball. We put a basketball on the sea. When the wind blows, a wave comes from behind the basketball. The basketball moves up to the top with the wave. Then the wave continues and leaves the basketball behind. The basketball looks lower, but it doesn’t move forward. That’s because the wave energy just moves the water which is under the basketball.
    　  So why can you see a wave knock you down on the shore？When a wave moves toward the shore, the bottom of the wave slows down because it meets the ocean floor. But the top, which is called crest(浪峰), keeps moving. The different action causes the wave to fall over or break onto the shore. If a wave is very large, it carries a lot of energy when it hits the land. As time goes by, waves can break up and carry away the rocks and other things on the shore. Shorelines are changing all the time because of wave action.
    小题1:______ is really moving forward when you look at the wave.
    A．WaterB．The basketballC．Water and wave energyD．Wave energy
    小题2:Match the sentences with the pictures and the right answer.
    (1) The basketball moves up to the top with the wave.
    (2) The basketball continues and leaves the basketball behind.
    (3) When the wind blows, a wave comes from behind the basketball.
    A．a—(2) b—(1) c—(3)B．a—(3) b—(1) c—(2)
    C．a—(1) b—(3) c—(2)D．a—(3) b—(2) c—(1)
    小题3:Which of the following is NOT true according to the passage?
    A．Wave energy comes from the water.
    B．Large waves carry plenty of energy.
    C．Wave action makes shorelines change all the time.
    D．The bottom of the wave is easy to slow down.
    小题4:The underlined word “it” ( Paragraph 3) refers to “________”.
    A．particles of waterB．the shoreC．the windD．the bottom of the wave
    小题5:The main idea of this passage is ______.
    A．what makes particles of water moveB．how a basketball moves on the ocean
    C．how wave energy causes wave actionD．why a wave can knock you down

    小题1:D
    小题2:B
    小题3:A
    小题4:D
    小题5:C

    试题分析：这篇短文主要介绍了波浪的形成原理和其运动特点。
    小题1:根据第一段When you stand on the shore and look at the waves, it seems like the water is moving towards you. But the water is not really moving forward. The moving you see is wave energy.描述，可知选D。
    小题2:根据图片可知风力来自左边，结合短文第二段描述，可知搭配正确的一组是B。
    小题3:根据And wave energy comes from the wind.描述，可知选A。
    小题4:联系前文描述，可知这个代词指的是海浪的下部，故选D。
    小题5:这篇短文主要介绍了波浪能是如何引起波浪作用的。故选C。
    点评：本文中长句较多，一时很难读懂句子含义，注意多读几遍，不要强求非得理解一词一句的含义，能把握文章大意就行。然后带着问题阅读短文，一般就能顺利找出答题依据。对于不能直接找到根据的问题注意联系上下文，根据短文中心总结出正确答案。
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    完形填空．
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