[讨论]FeiFei－46

doubaozi

46. Twelve healthy volunteers with the Apo-A-IV-1 gene and twelve healthy volunteers who instead have the Apo-A-IV-2 gene each consumed a standard diet supplemented daily by a high-cholesterol food. A high level of cholesterol in the blood is associated with an increased risk of heart disease. After three weeks, the blood cholesterol levels of the subjects in the second group were unchanged, whereas the blood cholesterol levels of those with the Apo-A-IV-1 gene rose 20 percent. 

Which one of the following is most strongly supported by the information above?

A.        Approximately half the population carries a gene that lowers cholesterol levels.

B.        Most of those at risk of heart disease may be able to reduce their risk by adopting a low-cholesterol diet.

C.        The bodies of those who have the Apo-A-IV-2 gene excrete cholesterol when blood cholesterol reaches a certain level.

D.       The presence of the Apo-A-IV-1 gene seems to indicate that a person has a lower risk of heart disease.

E.        The presence of the Apo-A-IV-2 gene may inhibit the elevation of blood cholesterol.

详解版本给出答案如下：

A：无关   B：无关   C：与所提供的信息相反    D：无关

E：正确，inhibit the elevation of blood cholesterol-----〉the blood cholesterol levels of the subjects in the second group

谁能解释一下C选项是怎么与题目提供的信息相反了？我觉得这也是可以被支持的选项之一啊。

excrete cholesterol when blood cholesterol reaches a certain level-----〉the blood cholesterol level remain low or unchanged 不是吗？

仔细想想可能E是更标准的答案，可是谁给偶讲讲排除C的具体原因，或者E比C到底具体好在什么地方？

[此贴子已经被作者于2007-6-23 10:05:27编辑过]

jandjshi

I don't think C 与所提供的信息相反. Maybe you can argue that passage indicates “the second group were unchanged”, whereas C states “reaches a certain level”, which can imply a increase occurred. But I don’t think that’s a reason to reject C.

If the question is: Which one of the following most strongly support the information above? Then C is the best question. But question is asking which one is supported “BY” the information above, and the information above does not give any indications of  what  Apo-A-IV-2 gene does to cholesterol. Therefore, C is wrong.

doubaozi

支持与被支持的关系，明白了