本质教育论坛

CR question (tropical island)

Hi Zeyue,

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.

The answer is A but I selected B, because I was unable to understand A. Can you explain why A is the correct answer to me?

Thanks a lot

这个就是阅读理解的问题了

原文讲的是: rats 1) exposed to (接触到)substances aflatoxin 2) fed milk protein -> liver cancers

原文中这些穷人得到milk powder = milk protein

A说的就是这些人吃的主食(staple)中有发霉的花生 -> 产生aflatoxin,那么两个条件就都一样了。