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  3. Very high waves are destructive when they strike the land. Fortunately, this seldom happens. One reason is that out at sea, wave

Very high waves are destructive when they strike the land. Fortunately, this seldom happens. One reason is that out at sea, wave

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问题     Very high waves are destructive when they strike the land. Fortunately, this seldom happens. One reason is that out at sea, waves moving in one direction almost always run into waves moving in a different direction. The two sets of waves tend to cancel each other out. Another reason is that water is shallower near the shore. As a wave gets closer to land, the shallow bottom helps reduce its strength.
    But the power of waves striking the shore can still be very great. During a winter gale, waves sometimes strike the shore with the force of 6, 000 pounds for each square foot. That means a wave, 25 feet high and 500 feet long it face, may strike the shore with a force of 75 million pounds.
    Yet the waves, no matter how big or how violent, affect only the surface of the sea. During the most raging storms, the water a hundred fathoms(600 feet)beneath the surface is just as calm as a day without a breath of wind.
From the second paragraph of the passage we know that the power of very high waves striking the shore is______.
选项 A、constant
B、equalized
C、variable
D、perpetual
答案C
解析 本题为段落理解和词义辨析题。从第1、2段所提供的信息可知，海浪对海岸的冲击力是有变化的。在4个选项中，constant意为“固定不变的，连续发生的”；equalized意为“均等的”；variable意为“易变的，多变的”；perpetual意为“持久的，长久的”。
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