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  3. Tides are created mainly by the pull of the moon on the earth. The moon’s pull causes water in the oceans to be a little deeper

Tides are created mainly by the pull of the moon on the earth. The moon’s pull causes water in the oceans to be a little deeper

admin2010-12-06  102
问题    Tides are created mainly by the pull of the moon on the earth. The moon’s pull causes water in the oceans to be a little deeper at a point closest to the moon and also at a point farthest from the moon, on the opposite side of the earth. These two tidal "waves" follow the apparent movement of the moon around the earth strike nearly every coastline at intervals of about twelve hours and twenty-five minutes. After reaching a high point, the water level goes down gradually for a little more than six hours and then begins to rise toward a new high point. Hence, most coastlines have two tides a day, and the tides occur fifty minutes later each day. Differences in the coastline and in channels in the ocean bottom may change the time that the tidal wave reaches different points along the same coastline. The difference in water level between high and low tide varies from day to day according to the relative positions of the sun and the moon because the sun also exerts a pull on the earth, although it is only about half as strong as the pull of the moon. When the sun and the moon are pulling along the same line, the tides rise higher, and when they pull at right angles to one another, the tide is lower. The formation of the coastline and variations in the weather are additional factors which can affect the height of tides. Some sections of the coast are shaped in such a way as to cause much higher tides than are experienced in other areas. A strong wind blowing toward the shore may also cause tides to be higher.  
If the pull of the sun equaled the pull of the moon, tides would ______.
选项 A、sometimes be higher than they are now
B、be the same height they are now
C、no longer be affected by the wind
D、be of equal height all the time
答案A
解析 如果太阳的引力等于月亮的引力，有时候潮水就会比现在更高。根据本文提供的信息，月亮的引力和太阳的引力都影响地球上的潮汐，但是月亮的引力对潮汐的影响比太阳的引力对潮汐的影响要大。因此，假设太阳的引力和月亮的引力相等，海岸线上潮水的水位就可能会更高一些。
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