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our passages. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B. C and D. You are required to decide on the choice that best answers the question or pletes the statement. Passage One Questions 21 to 25 are based on the following passage. Very high waves arc 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 along its face, may strike the shore with a force of 75 million pounds. (91) 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 on a day without a breath of wind. 21. According to the passage, destruction caused by high waves occurs ______ A. regularly B. rarely C. always D. predictably 22. It is implied that Out at sea, when waves going in opposite directions meet. their force _______ A. causes great damage B. extends to the ocean floor C. is liable to lessen D. increases rapidly 23. Coastal depth _______ A. is the only factor influencing the strength of high waves B. has enormous influence on the force of high waves C. has no influence on the strength of very high waves D. is irrelevant to the power of high waves 24. It can be inferred from Para. 2 that the power of high waves striking the shore is _______ A. constant B. equalized C. variable D. perpetual 25. It is impossible for the high waves ______ A. to bring about most raging storms B. to have an effect on the sea bottom C. to affect the surface of the sea D. to cause damage to the land