Health officials attribute this decrease entirely to improved sanitary conditions at water-treatment plants.所以是很明显的因果关系的逻辑推理.如果削弱的话无非以下几种,这在读懂题的同时应该马上能反应的出: 1.有因无果:比如,某段时间也曾improved sanitary conditions at water-treatment plants,但是intestinal disease 没有decrease 2.有果无因:比如,某段时间intestinal disease 也有decrease,却sanitary conditions at water-treatment plants没有improved 3.给出他因:比如,C 4.因果倒置:比如,是因为intestinal disease decrease,才引起什么什么,最后导致sanitary conditions at water-treatment plants improve 具体视题目而定,比如此题情况4就很勉强,但是有道题不知道大家有没有印象,说是夫妻作息时间不同引起冲突什么的,答案就是因果倒置. |