XDF的一题，大全中没有

whales originated in the freshwater lakes and rivers of ancient Aisa about sixty million

years ago. Not until about ten million years later did species of whales develoed

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 whales 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 Aisa 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.

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 fresh water lakes and rivers

in which whales originated were gradually invaded by salt water.

答案是A。实在不理解

我对题目的理解如下：　

一直到ten million years 以后，鲸鱼才有了特殊的肾使得他们喝咸海水

早期的没有特殊肾的鲸鱼虽然可以在海水里游泳，但他们必须时不时地跑回淡水中去　

Ａ　这句话不理解是什么意思？麻烦帮忙翻译一下

是这样！

哎，说一下我的理解，我就是不理解为什么被分割出去的大陆不可能有鲸鱼，题目说鲸鱼是originated in the freshwater lakes and rivers of ancient Aisa about sixty million years ago，被分割出去的大陆也应该有河和湖啊，呵呵

不是没有鲸鱼,而是没有亚洲的鲸鱼~

还是不明白!

In A, since the continents were seperated from ancient Aisa by wide expanses of ocean, if whales wanted to reach the continents, they would have to swim for long time in the ocean. In that case, they had to develop specialized kidneys. So A is supported