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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 o-ceans 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 o-ceans to be a little deeper

admin2015-01-09  23
问题     Tides are created mainly by the pull of the moon on the earth. The moon’s pull causes water in the o-ceans 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 and strike nearly every coast line 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 towards a new high point. Hence,most coast lines have two tides a day,and the tides occur fifty minutes later each day. Differences in the coast line and in channels in the ocean bottom may change the time that the tidal wave reaches different points along the same coast line. 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 coast line 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 in other areas. A strong wind blowing towards the shore may also cause tides to be higher.
Which of the following is an accurate statement about the pull of the sun on the earth?
选项 A、It determines the time of high tide.
B、It is about twice the pull of the moon.
C、It determines the time of low tide.
D、It is about half the pull of the moon.
答案D
解析 题目问：下列哪项准确地描述了太阳对地球的引力?第七句“The difference in water level betweenhigh 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 themoon．”通过这段话可知，太阳对地球的拉力只相当于月球对地球引力的一半。据此判断，应选择D。
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