逻辑11

寂寞的自由

17.(?)Of the countries that were the world's twenty largest exporters in 1953, four had the same share of total world exports in 1984 as in 1953. Theses countries can therefore serve as models for those countries that wish to keep their share of the global export trade stable over the years.Which of the following, if true, casts the most serious doubt on the suitability of those four countries as models in the sense described? (A) Many countries wish to increase their share of world export trade, not just keep it stable.(B) Many countries are less concerned with exports alone than with he balance between exports and imports.(C) With respect to the mix of products each exports, the four countries are very different from each other.(D) Of the four countries, two had a much larger, and two had a much smaller, share of total world exports in 1970 than in 1984.(E) The exports of the four countries range from 15 percent to 75 percent of the total national output.
答案是什么，C怎么考虑呢？谢谢大家！！！

kathy72

1953年的出口份额=1984年的出口份额---> 四国多年来出口稳定

D 说1953年到1984年间四国的出口份额有较大波动, 因此不稳定, 削弱了结论. 也就是说, 原文是从两个时点来判断一段时间的走势, D从一个时间段来判断.

C说的是各国出口商品的构成不同, 但原文说的是各国的出口份额, 等于各国出口额与世界出口总值比较, 与产品种类无关.