标题: 亲们，进来吧。 [打印本页] 作者: jackba8888 时间: 2011-11-12 22:05 标题: 亲们，进来吧。 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.
亲们，帮个忙，留下个脚印，如果能解释一下那更好了。 作者: peishiqi8911 时间: 2011-11-12 22:09
A 怎么对的不知道 看b c d e 都错了作者: 四叶草clover 时间: 2011-11-12 22:21
因为sixty million and fifty million years ago 的时候他们没用kidney,所以他们不可能离开古亚洲穿越海洋去另外一个大陆作者: zhengzoe 时间: 2011-11-13 11:32
啊~这样啊~谢谢四叶草~