涛涛31 - 1#19

asupls

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 _______.

 

1. in the tropics, peanuts, a staple of these island residents, support a mold growth that produces aflatoxin
2. the liver is more sensitive to carcinogens, of which aflatoxin may be one, than most other bodily organs
3. casein is not the only protein contained in milk
4. powdered milk is the most appropriate form in which to send milk to a tropical destination
5. the people who were given the donated milk had been screened for their ability to digest milk

答案是A，可我觉得好奇怪啊，为什么没有一个看上去是能够support原文的？A看上去是削弱了原文啊，这不是它因吗？

请各位指教，谢谢！

祝五一愉快

DavidSimms

I vote 'B'

肝脏更加容易出问题，而不是其他的器官

这个题的逻辑貌似在讲奶粉和肝癌的关系，比较顺的思路是找一个联系casein和powered milk的关系的选项做答案

A看上去没有什么关系，应该不是正确答案吧

raikey

A还是说得通的.

原文说:feed casein之后如果expose to aflatoxin 才会导致cancer.

B是无关比较.

asupls

对哦，突然发现自己少看了几个字，原来有两个物质在这段文字里，现在看来A很清晰了，谢谢大家，真是个傻问题，见笑了

DavidSimms

i got it as well...hehe

thanks