問題詳情

請依下文回答第 21 題至第 25 題 Why does the ocean move? What causes the waves? Blowing winds move the water on the surface of the ocean.There are consistent winds that travel across the world's oceans, creating surface currents. Cold winds that blow fromthe North and South Poles carry cold water toward the warm, central parts of the Earth. At the same time, surfacecurrents from these warm, central parts shift warm water toward the North Pole and the South Pole. As the Earth turnsfrom east to west, that turning also causes currents to move. Another thing that makes ocean water move is temperature. Cold water is denser than warm water. Cold watersinks while warm water rises up. The deeper you go into the ocean, the colder the water is. Deep beneath the surface,large streams of cold water move in very long underwater currents. As the water moves, some of it begins to warm up.Then the cooler water underneath pushes the warm water to the surface. This interaction between cold water and warmwater is what makes water move below the surface. The influence of the moon and the sun helps move the water in the ocean by creating tides. At high tide, watercovers more of the beach because it has been pulled higher by the influence of the moon and the sun. At low tide, thewater is farther away. Tides vary in strength daily and seasonally. All these elements work together to create themotion of the seas.
21 Which of the following is closest in meaning to the underlined word vary?
(A) move
(B) trace
(C) change
(D) validate

參考答案

答案：C
難度：適中0.464286
統計：A(13),B(8),C(26),D(5),E(0)

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