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突然又想起一道CRjj,就是GWD那道鲸鱼长肾咸淡水那到题目

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楼主
发表于 2008-6-13 22:28:00 | 只看该作者

突然又想起一道CRjj,就是GWD那道鲸鱼长肾咸淡水那到题目

Whales originated in the freshwater lakes and rivers of ancient Asia about sixty million years ago.  Not until about ten million years later did species of whales develop specialized kidneys enabling them to drink salt water.  Although fossil evidence shows that some early whale species that lacked such kidneys sometimes swam in the Earth’s saltwater oceans, these species must have had to return frequently to freshwater rivers to drink.

 

Which of the following is most strongly supported by the information given?

 

  1. Fossils of whale species dating from between sixty million and fifty million years ago will not be found on continents that were at the time separated from ancient Asia by wide expanses of ocean.

  2. Among whale fossils that date from later than about fifty million years ago, none are fossils of whale species that drank only fresh water.

  3. Fossils of whale species that drank fresh water will not be found in close proximity to fossils of whale species that drank salt water.

  4. The earliest whales that drank salt water differed from fresh-water-drinking whales only in their possession of specialized kidneys.

  5. Between sixty million and fifty million years ago, the freshwater lakes and rivers in which whales originated were gradually invaded by salt water.

A     

沙发
 楼主| 发表于 2008-6-13 22:29:00 | 只看该作者
忘了贴答案了,选A
板凳
发表于 2008-6-13 22:45:00 | 只看该作者
谢谢楼主,这道题我当时做的时候做错了,希望考试的时候能碰上。
地板
发表于 2008-6-13 23:44:00 | 只看该作者

The baby is very very cute~~!! Thanks~!


[此贴子已经被作者于2008-6-13 23:44:03编辑过]
5#
发表于 2008-6-14 09:53:00 | 只看该作者

看来这个月的cr不简单

全部是gwd的极品难题

如果想拿到高分还得冲破这些难题

6#
发表于 2008-6-14 22:35:00 | 只看该作者

谢谢楼主

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