No nation can long survive unless its people are united by a common tongue. For proof, we need only consider Canada, which is being torn asunder by conflicts between French-speaking Quebec and the other provinces, which are dominated by English speakers.

Which of the following, if true, most effectively challenges the author’s conclusion?

(A) Conflicts over language have led to violent clashes between the Basque-speaking minority in Spain and the Spanish-speaking majority.

(B) Proposals to declare English the official language of the United States have met with resistance from members of Hispanic and other minority groups.

(C) Economic and political differences, along with linguistic ones, have contributed to the provincial conflicts in Canada.

(D) The public of India, in existence sine 1948, has a population that speaks hundreds of different, though related, languages.（E）

(E) Switzerland has survived for nearly a thousand years as a home for speakers of three different languages.

答案是e,我选c

看了c之后就没有再接着往下看，c是说，不只是语言造成了conflict,还有其他的原因。我认为起到了challenge的作用。

明白e起到了challenge作用。

但是怎样比较c和e哪个更能challenge呢？

是不是逻辑题都要把选项读一遍之后才能选呢？

谢谢！

C虽然提到了其他原因，但是也承认语言也是一个原因啊。如果语言也是一个矛盾的原因，加拿大的矛盾就可能是因为这个原因引起的，间接的支持了作者的论断。

可是E就摆明了语言根本就不是矛盾的原因，瑞士有三种语言都存在一千多年了，所以加拿大的矛盾就不是语言造成的。

仅供参考

保险起见，还是各个选项都看一下，如果时间有富余的话。