GWD-10-Q19

GWD-10-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       .

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.

请问为什么是答案A？A中都没有涉及powdered milk

A说明了真正的原因是peanuts,与milk无关

题目中提到了老鼠的实验

当老鼠暴露在aflatoxin之下又被喂了casein，容易生cancer

而casein是一种milk protein

表示人类在以上情况同时发生的时候就会生cancer

答案A表示热带地区的人种植的peanuts support a mold growth that produces aflatoxin

再加上题目中所描述milk powder中含有的casein被人类吃进去

就跟实验中的老鼠一样容易生cancer了

A：

得病的原因是milk+aflatoxin

milk已经提供了，在有关aflatoxin那么就大功告成了,

如果主食里面有aflatoxin那么加上milk，癌症就多了