gwd-10-19求助

答案是a我选b 我觉得a 无关阿

就是milk rat livercancer 那个题

Q19:
Which of the following most logically completes the passage?
A certain tropical island received food donations in the form of powdered milk for
distribution to its poorest residents, who were thought to be malnourished. Subsequently,
the rate of liver cancers among those islanders increased sharply. The donated milk was
probably to blame: recent laboratory research on rats has shown that rats briefly exposed
to the substances aflatoxin tend to develop liver cancer when fed casein, a milk protein.
This result is relevant because _______.
A. in the tropics, peanuts, a staple of these island residents, support a mold growth
that produces aflatoxin
B. the liver is more sensitive to carcinogens, of which aflatoxin may be one, than
most other bodily organs
C. casein is not the only protein contained in milk
D. powdered milk is the most appropriate form in which to send milk to a tropical
destination
E. the people who were given the donated milk had been screened for their ability to
digest milk

i think A is right

实验说如果老鼠吃了casein, a milk protein 并接触到the substances aflatoxin后, 就会tend to develop liver cancer. 结合A的内容, 所以, 这个实验是更前面发生的事有关连.

Choose A. The question ask you to choose one evidence to support whether aflatoxin (which is a key element in rat expriment) is also a key in human boy.

D is absolutely unrelevent. The question ask nothing about the formation of the milk. (powder=粉末)

B is also unrelevent, because it just mention the liver (liver=肝脏). Also you don't recognize the work, you can judge this answer wrong through "organs"(器官)

A is right, because it reveal that human in this tropic island also have the aflatoxin which will develop caner with  casein in milk.

      i think  A is the right answer

      agree with jojocarter

       B and D are irrelvant to the conclusion.

a，只有a才是把两个东西建立联系的唯一选项。