逻辑JJ求解释。。。

shanavane

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.


A选项什么意思啊........

69. GWD-14-Q15 【by wangyang1195】

og上原材料，题目不同，是问原因.

Fact:Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages.

Fact:Over 95 percent of people who have asthma also suffer from hay fever.



If the information given as facts above is true, which of the following must also be true?

A.Hay fever is a prerequisite for the development of asthma.

B.Asthma is a prerequisite for the development of hay fever.

C.Those who have neither hay fever nor asthma comprise less than 5 percent of the total population.

D.The number of people who have both of these ailments is greater than the number of people who have only one of them.

E.The percentage of people suffering from hay fever who also have asthma is lower than 95 percent
这题的变体和原体都是A吗？？