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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
admin
2010-12-06
69
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.
The time that high tide occurs at a particular place is affected by all of the following EXCEPT ______.
选项
A、tone position of the moon
B、the direction of the wind
C、channels in the sea bottom
D、variations in the coastline
答案
B
解析
某一个地方出现高潮的时间受以下因素的影响,B除外。文中的第六句和第七句指出了影响某个地方出现高潮的时间的诸多因素,唯独没有提到B。
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考博英语
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