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Life near the shore everywhere is affected by the tides, which come and go twice each day in a cycle of about twelve-and-a-half
Life near the shore everywhere is affected by the tides, which come and go twice each day in a cycle of about twelve-and-a-half
admin
2012-07-17
82
问题
Life near the shore everywhere is affected by the tides, which come and go twice each day in a cycle of about twelve-and-a-half hours—just different enough from the daily cycle of the sun so that there can be no regular relationship between the shore being alternately wet and dry and alternately light and dark. The extent of the tides varies greatly, from as little as one foot in inland seas like the Mediterranean, to fifty feet or so in the Bay of Fundy in Nova Scotia. In some parts of the world, one of the two daily tides rises higher and falls lower than the other; and tides at the time of new moon and full moon are generally greater than at other times. The extent of the intertidal zone thus varies from day to day as well as from place to place.
The kinds of organisms living in the region between the tidal limits depend very much on whether the shore is rocky, sandy, or muddy. Rocky shores have the most obviously rich faunas (某地区所有的动物),because of the firm anchorage for both animals and plants, and because of the small pools left by the retreating seas. Sandy shores, especially when exposed to surf (as they usually are), have the fewest kinds of animals.
Which of the following factors does not affect the extent of the tides?
选项
A、The composition of the shore soil.
B、The moon.
C、Time.
D、Place.
答案
A
解析
本题属于是非判断题,可采用排除法找到答案。文中第一段最后一句说:“因此,潮间带的范围除了随地点变化外也随着日期而改变。”因此我们可以排除选项C和D。文中第一段第三句说:“……在新月和满月时的潮汐规模一般要比其他时间的潮汐规模大。”由此我们又可以把选项B排除。
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