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题库 / Prep2008E1-CR-118
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 substance aflatoxin tend to develop liver cancer when fed casein, a milk protein. This result is relevant because __________.
in the tropics, peanuts, a staple of these island residents, support a mold growth that produces aflatoxin
the liver is more sensitive to carcinogens, of which aflatoxin may be one, than most other bodily organs
casein is not the only protein contained in milk
powdered milk is the most appropriate form in which to send milk to a tropical destination
the people who were given the donated milk had been screened for their ability to digest milk
情景：略
答案预估：
直接把老鼠的实验和人的情况联系在一起即可，即，突出人也接触到过aflatoxin（黄曲霉素）。
选项分析：
A选项：Correct. 在热带地区，花生，一个那里的人主要的吃的食物，会在身体中产生aflatoxin.
B选项：肝脏是比其他器官都容易受到像aflatoxin这类致癌物质的影响。
C选项：牛奶不仅仅含有casein一种蛋白质。
D选项：在热带地区，powdered milk最合适的牛奶运送方式了。
E选项：被捐赠牛奶的人都会被监测他的消化牛奶的能力。
这里把老鼠实验和岛民生病联系起来。先看一下老鼠实验的两个因素：
题目问这两种癌症产生的实验对比有关系在于，都有相同的致病因素如以下：
暴露在aflatoxin之中和喂casein （等同于奶粉）。
要使两者有联系，需要岛民接触Aflatoxin.
岛民的情况是怎样的呢？先是花生植株提供了Aflatoxin （选项A)，然后善意的人们又送来了牛奶，
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