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  3. There are many reasons of the tidal action which is a very complicated phenomenon involving many factors all of which must be co

There are many reasons of the tidal action which is a very complicated phenomenon involving many factors all of which must be co

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问题     There are many reasons of the tidal action which is a very complicated phenomenon involving many factors all of which must be considered to predict tide in any one place at any one time. The alternate rise and fall of the surface of the seas and the ocean is mainly caused by the attractive force of the moon alone. When the attraction is great, the tide is high; and conversely when the attraction is minimal, the tide is low. Between the high and the low tide is a period of a little over six hours, being called during its rise a flood tide, and during its fall an ebb tide.
     The sun also exerts its effect on the tide, being a lit fie less than half as much as the moon, although its mass is so much greater. When the moon and the sun are horizontal, the highest high tide occurs and when they are vertical the lowest low tide takes place.
     The wind also plays an important part in the modification of the normal rise and fall of the tide. Thus these factors affect each other, either detracting or adding to the attractive forces to add or subtract from the weight of the tide. But the tides still move inexorably on, rising twice a day, getting a little later each day and posing a problem of correctly predicting their heights and lows.
Which of the following factors will not affect the time of the tide?
选项 A、The position of the sun and the moon.
B、The mass of the moon.
C、The wind.
D、All of the above mentioned factors.
答案D
解析 本题为细节判断题。作者在三段中分析了影响潮起潮落的三个因素，即月球的引力、太阳与月球的位置以及风的作用，并在最后一段第二句总结说这些因素的相互作用会减弱或加强月球的引力，从而影响到潮水的涨落程度。文中并没有提到影响涨落潮时间的因素。
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