GWD 1-19

kaki3193_cn

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

itokinblue

你能不能讲讲你的思路？？

kaki3193_cn

答案给的A

A中提到peanut导致aflatoxin的产生,但是原文说的是应该归罪于 donated  milk,这两个不相干啊....

itokinblue

不是相干不相干的问题，首先我们把题目的意思大概读一遍．

就是说给了奶粉后，这个地方的liver cancer增加了，通过实验可以反映出，将rats exposed to a这种物质后它就也会得liver cancer,不过前提不要忘记了，在喂过一种蛋白质c后

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 （liver更加敏感，不相关）
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（这个显然可以排除）
           
5. the people who were given the donated milk had been screened for their ability to digest milk（这个显然也可以排除）

我刚才在看的时候就是a和c了．那么题目说要relevent实际上就是a和c的作用．

我们来看Ｃ，c不是唯一的蛋白质，取非，它是唯一的又能怎么样呢？其实这是无关的

Ａ选项，提到了a的生长，在某种特定的情况下它可以迅速增长，那么和奶粉一起作用导致了前面的结果．

一般看到这种题目心里应该想到，后面出现了一种新物质，那么答案应该和新物质有关．．．

这仅仅是我自己的一点点想法～

kaki3193_cn

恩...我开始选的是C..

现在理解啦

谢谢LS

sophia725

up ,还是不习惯在电脑上看题,累!