2019年全国统一考试（天津卷）英语独家解析(21)

【44题详解】
细节理解题。根据第五段中By opening a novel, I can leave behind my burdens and enter into a wonderful and mysterious world where I am now a new character. In these worlds I can become anyone.(打开一本小说，我可以摆脱我的负担，进入一个奇妙而神秘的世界，我现在是一个新的角色。在这个世界上，我可以成为任何人。)可知，阅读小说可以让作者避开复杂的现实而投入到小说中的世界中去，故选D。
【45题详解】
主旨大意题。根据全文内容可知，作者以时间顺序回忆了自己的阅读经历和感悟，作者伴着阅读成长，故选项C为最佳标题。
C
How does an ecosystem(生态系统) work? What makes the populations of different species the way they are? Why are there so many flies and so few wolves? To find an answer, scientists have built mathematical models of food webs, noting who eats whom and how much each one eats.
With such models, scientists have found out some key principles operating in food webs. Most food webs, for instance, consist of many weak links rather than a few strong ones. When a predator(掠食动物) always eats huge numbers of a single prey(猎物), the two species are strongly linked; when a predator lives on various species, they are weakly linked. Food webs may be dominated by many weak links because that arrangement is more stable over the long term. If a predator can eat several species, it can survive the extinction(灭绝) of one of them. And if a predator can move on to another species that is easier to find when a prey species becomes rare, the switch allows the original prey to recover. The weak links may thus keep species from driving one another to extinction.