22. GWD27-Q22: 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?
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. Among whale fossils that date from later than about fifty million years ago, none are fossils of whale species that drank only fresh water. Fossils of whale species that drank fresh water will not be found in close proximity to fossils of whale species that drank salt water. The earliest whales that drank salt water differed from fresh-water-drinking whales only in their possession of specialized kidneys. Between sixty million and fifty million years ago, the freshwater lakes and rivers in which whales originated were gradually invaded by salt water.作者: godgodme 时间: 2011-11-5 17:27
谢谢LZ! 是选A吗？作者: 西经 时间: 2011-11-5 17:28
是滴是滴~~~作者: 心有林夕一点通 时间: 2011-11-5 17:29
The correct answer is A.作者: sallyonet 时间: 2011-11-5 17:38
太感谢啦作者: dovyzhu 时间: 2011-11-5 17:51
谢谢！！作者: conniewang910 时间: 2011-11-5 17:59
谢谢楼主！真是好人！作者: flyingnoodle 时间: 2011-11-5 19:54
好人，谢谢作者: hechagu 时间: 2011-11-5 22:04
楼主好人，谢谢