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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.
It’ s clear from the passage that coastal depth______.
选项 A、is the only factor influencing the strength of high waves
B、influences the power of high waves
C、has no influence upon the strength of very high waves
D、is irrelevant to the question of the power of high waves
答案B
解析 本题为推断题。从第1段的最后一句得知，随着海浪接近陆地，浅海海底会有助于削弱海浪的威力。由此推断，选项B正确。
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