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A、They lose water constantly. B、They contain a relatively lower concentration of salt. C、They neither lose nor absorb water. D、T
A、They lose water constantly. B、They contain a relatively lower concentration of salt. C、They neither lose nor absorb water. D、T
admin
2013-06-02
98
问题
Fish live in water, but do they drink it? The answer is yes, but how fish drink water depends on where they live. Water gets into a fish’s body through osmosis. Take a cell as an example, if there is more water outside of a cell than inside, water will try to flow into the cell until there is the same concentration of water on either side of the cell’s membrane. The body of a fish acts the same way, (33) either absorbing or losing water depending on its surroundings.
Whether a fish absorbs or loses water is based on the fact that all fish must maintain a certain amount of salt in their bodies to stay healthy. (34) Fish that live in fresh water have a higher concentration of salt in their bodies than the surrounding water. Consequently, water continuously flows into the fish’s body to attempt to dilute the amount of salt in the fish until it is equal to the amount of salt in the surrounding water.
Ocean fish have the opposite problem. Surrounded by salt water, their bodies contain a relatively lower concentration of salt than the ocean water. In this case osmosis causes the fish to constantly lose water in order to equalize salt concentration inside and outside the fish. To partially compensate for the water loss, ocean fish actually drink water through their mouths. And (35) to get rid of the excess salt they take in by drinking seawater, they excrete some salt through cells in their gills.
选项
A、They lose water constantly.
B、They contain a relatively lower concentration of salt.
C、They neither lose nor absorb water.
D、They possess a relatively higher concentration of salt.
答案
D
解析
根据原文,咸水鱼体内的盐分低于周围的水环境,而淡水鱼体内的盐分相对高于其周围的水环境,故选D项。
转载请注明原文地址:https://kaotiyun.com/show/N167777K
0
大学英语六级
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