问一套逻辑题

william1971UID: 3002671

4.Although spinach is rich in calcium, it also contains large amounts of oxalic acid, a substance that greatly impedes calcium absorption by the body. Therefore, other calcium-containing foods must be eaten either instead of or in addition to spinach if a person is to be sure of getting enough calcium.
Which of the following, if true, most seriously weakens the argument above?

(A)Rice, which does not contain calcium, counteracts the effects of oxalic acid on calcium absorption.
(B) Dairy products, which contain even more calcium than spinach does, are often eaten by people who eat spinach on a regular basis.
(C) Neither the calcium nor the oxalic acid in spinach is destroyed when spinach is cooked.
(D) Many leafy green vegetables other than spinach that are rich in calcium also contain high concentrations of oxalic acid.
(E) Oxalic acid has little effect on the body's ability to absorb nutrients other than calcium.
别人的解释： 要削弱结论，那么必然有使人们可以不吃额外的或者吃其他的含钙食物的选项，A明显可以，BCDE都不行。

我的疑问：难道大米不算额外的食物，难道本题对象一定都吃大米？ 都是中国人？（北方人也有不吃米的。。。。）

william1971UID: 3002671

自己顶一下

humewangUID: 3362165

老兄啊，你的问题不是逻辑，而是阅读。呵呵
这里题中的论点是：菠菜中虽有钙，但也有酸，阻碍钙的吸收，所以还要吃其他的富含钙的食物以吸收足够的钙。A所，米虽不含钙，却可以中和菠菜中酸的作用。所以，只要吃米和菠菜，那么不需要吃“其他的富含钙的食物”，就可以得到足够的钙。
这里的其他，可不是其他的食物，而是“other calcium-containing foods”

william1971UID: 3002671

humewang 发表于 2012-8-21 16:57
老兄啊，你的问题不是逻辑，而是阅读。呵呵
这里题中的论点是：菠菜中虽有钙，但也有酸，阻碍钙的吸收，所 ...

谢谢，我没注意审题~~