【正文】
時(shí)間段的特征時(shí),只要將與之相反的時(shí)間段的特征否定掉就可以了。 集合概念推理 : 一個(gè)大的集合的兩個(gè)方面形成對(duì)比,兩者之間存在著互補(bǔ)性關(guān)系,也就是一個(gè)的增加意味著另一個(gè)的減少。反之,相同。這個(gè)比較抽象,我們來(lái)看一個(gè)例子: 例 如:Both the number and the percentage of people in the United States involved in nonagricultural pursuits expanded rapidly during the half century following the civil war, with some of the most dramatic increases occurring in the domains of transportation, manufacturing, and trade and distribution?! hat can be inferred from the passage about the agricultural sector of the economy afte