2. 外语
  3. Kale has more nutritional value than spinach. But since collard greens have more nutritional value than lettuce, it follows that

Kale has more nutritional value than spinach. But since collard greens have more nutritional value than lettuce, it follows that

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问题 Kale has more nutritional value than spinach. But since collard greens have more nutritional value than lettuce, it follows that kale has more nutritional value than lettuce. Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:
选项 A、Collard greens have more nutritional value than kale.
B、Spinach has more nutritional value than lettuce.
C、Spinach has more nutritional value than collard greens.
D、Spinach and collard greens have the same nutritional value.
E、Kale and collard greens have the same nutritional value.
答案A
解析 问题要求找出一项增加的前提不能使该论述在逻辑上是正确的。将选项(A)加入到短文给出的信息中，按照营养价值的顺序有可能有出现这样的蔬菜排列：collard greens，lettuce，kale，spinach，因为这个顺序同该论述的结论矛盾，(A)存在使该论述的结论成为错误的可能性，(A)因此是正确答案；相比较而言，(B)、(C)、(D)和(E)中的任何一个，加到短文中去时，由于Kale的营养价值比Spinach高，并且Collard greens的营养价值比lettuce高，使得该结论——kale比lettuce更有营养价值——在逻辑上顺理成章。
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