答案是a我选b 我觉得a 无关阿
就是milk rat livercancer 那个题
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 _______.
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
i think A is right
实验说如果老鼠吃了casein, a milk protein 并接触到the substances aflatoxin后, 就会tend to develop liver cancer. 结合A的内容, 所以, 这个实验是更前面发生的事有关连.
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 _______.
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
I think A is right ,
Choose A. The question ask you to choose one evidence to support whether aflatoxin (which is a key element in rat expriment) is also a key in human boy.
D is absolutely unrelevent. The question ask nothing about the formation of the milk. (powder=粉末)
B is also unrelevent, because it just mention the liver (liver=肝脏). Also you don't recognize the work, you can judge this answer wrong through "organs"(器官)
A is right, because it reveal that human in this tropic island also have the aflatoxin which will develop caner with casein in milk.
i think A is the right answer
agree with jojocarter
B and D are irrelvant to the conclusion.
a，只有a才是把两个东西建立联系的唯一选项。
有疑惑向大家请教.
A选项似乎有问题, 如果peanuts是staple的话, 应该说明liver cancer的出现几率应该是稳定的, 因为经常吃, 和原文所说的liver cancer increased sharply有矛盾. 所以A应该不能解释前文所描述的现象, irrelevant.
相反B强调了肝脏对这种物质特别敏感, 所以喝了牛奶之后, 肝癌迅速增加, 而不是胃癌, 肠癌之类的, relevant.
请大家指教!
有疑惑向大家请教.
A选项似乎有问题, 如果peanuts是staple的话, 应该说明liver cancer的出现几率应该是稳定的, 因为经常吃, 和原文所说的liver cancer increased sharply有矛盾. 所以A应该不能解释前文所描述的现象, irrelevant.
以前没有牛奶，即没有casein,所以有aflatoxin也不得liver cancer
相反B强调了肝脏对这种物质特别敏感, 所以喝了牛奶之后, 肝癌迅速增加, 而不是胃癌, 肠癌之类的, relevant.
这段话focus是the donated milk was probably to blame to sharply increased liver cancer. 而other bodily organs绝对是out of scope信息，排除。
请大家指教!
我也选的是B ， lawyer能不能来确认一下？
明白了。
刚开始题目没看仔细，以为aflatoxin包含在casein里面，从而推出aflatoxin是致癌物质。所以选了B。
Exan解释的清楚，aflatoxin和casein共同作用才能致癌，选A。
罗德斑竹可能也是题目没看清了。
明白了。
刚开始题目没看仔细，以为aflatoxin包含在casein里面，从而推出aflatoxin是致癌物质。所以选了B。
Exan解释的清楚，aflatoxin和casein共同作用才能致癌，选A。
罗德斑竹可能也是题目没看清了。
感謝msfox 我也看了許久才懂
這的確是題目意思的問題 大家應該都沒看清 看清就不難了
实验说如果老鼠吃了casein, a milk protein 并接触到the substances aflatoxin后, 就会tend to develop liver cancer.
A中说的是这个地区的花生是他们的主要食物,产生霉菌中含有AF,但是无法联系到CANCER
rats briefly exposed to the substances aflatoxin tend to develop liver cancer when fed casein
這裡不是指短暫接觸嗎
A中的peanuts, a staple
不就是指人們長期接觸aflatoxin了嗎
我覺得兩個互相矛盾
有道理。我原来选d现在选a ,因为老鼠是在吃了milk protein并接触了afl之后才得cancer,而如果人要得cancer 他在应该也要吃milk protein 并接触afl。
誰幫我釐清一下
题中说的就是subsequently啊，随后的意思
同意A。
老鼠得肝癌的两个条件：1）exposed to aflatoxin；2）fed casein。所以要得出居民得肝癌跟老鼠得肝癌的试验有关，也必须满足这2个条件。原文说明2)已满足；而A正是1).
这道题应该是A。
注意理解原文rats briefly exposed to the substances aflatoxin tend to develop liver cancer when fed casein这句话，实际上只要接触aflatoxin这种物质，就会导致liver cancer，和肝脏的敏感不敏感没有关系。选项只要证明aflatoxin的生成条件成立，原文结论就相关并成立，答案A正好满足此条。
哪位NN解释一下这体？
明白了。
刚开始题目没看仔细，以为aflatoxin包含在casein里面，从而推出aflatoxin是致癌物质。所以选了B。
Exan解释的清楚，aflatoxin和casein共同作用才能致癌，选A。
罗德斑竹可能也是题目没看清了。
还真是这么回事儿，我也是题没读懂，理解的跟msfox一样，看了大家的讨论再看题才突然明白过来。
好沒良心的題目..
看了大家的解释豁然开朗 这道题目我想没有take a 的原因在于rats briefly exposed to the substances aflatoxin tend to develop liver cancer when fed casein, a milk protein的理解问题 在有casein-a milk protein的存在情况下 那么加上aflatoxin就能致癌
对于那些residents而言 donated milk powder给出了casein存在的条件 还差一个条件就是aflatoxin了 a选项就补出了aflatoxin存在的条件 呵呵 自己的阅读功底还不到位
A + B —>C,
目前有C现象（liver cancer）,B原因（milk）,补出A原因（aflatoxin）即可。
靠，通过有关无关 推出A B 然后上当选B 郁闷
看不太懂题目
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