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标题: 急问本月一道CR JJ的答案,GWD-27-Q22 [打印本页]

作者: nbkp26o 时间: 2006-10-17 10:34
标题: 急问本月一道CR JJ的答案,GWD-27-Q22

我没有GWD-27, 有谁知道这题的正确答案吗？

顺便，哪位好心人能给我发一份GWD-27吗？就快考了。email: yeliuxin(A) hotmail.com

万分感谢！！！

作者: toapplezyj 时间: 2006-10-17 11:31

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

Answer is A

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