[求助]XDF蓝皮 89

chen83250245

 
 

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?

A. 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.

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

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

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

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

答案是A，为什么感觉A和题目关系不大啊，跟陆地有什么关系？期盼解答

这不是归纳题吗，归纳题可以用无关词排除，虽然感觉A说得也没错，但是A的答案是可以从题目中推出来的吗？感觉题目根本就没说过与陆地有关，以及鲸鱼能不能上岸的问题啊。

[此贴子已经被作者于2008-10-28 12:54:14编辑过]

chen83250245

请大家解答一下吧~~~~~

Monamona

我的理解是要注意题干里FREQUENTLY的和A选项的WIDE。就是说在WHALE还没进化出肾脏的时候，即便是有一部分WHALE可以暂时在咸水里生活，也不能长时间的穿过WIDE EXPANSES OF OCEAN.，所以就不可能出现除亚洲以外的地区存在 “Fossils of whale species dating from between sixty million and fifty million years ago ”的情况。

个人见解，请牛人指导。