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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.
It can be concluded from this article that the attraction of the sun is ______.
选项 A、more than half that of the moon
B、more than that of the moon
C、more than twice that of the moon
D、half that of the moon
答案D
解析 本题为细节推理题。第二段主题句明确指出尽管太阳自身的重量要比月球大得多，但其对于潮水所起到的作用连月球所起作用的一半还不到。由此可以推断太阳对潮水的引力只有月球引力的一半大小。
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