老杜托福100句（五）.pdf

老杜托福100 句 （五） 老杜托福100 句 （五） 句子1 If the physical barriers of the plant are breached, then preformed chemicals may inhibit or kill the intruder, and plant tissues contain a diverse array of toxic or potentially toxic substances, such as resins, tannins, glycosides, and alkaloids, many of which are highly effective deterrents to insects that feed on plants. 【难点解析】 本句的难点在于句子中涉及到一些化学类的单词，比如 resins, tannins, glycosides, alkaloids 等，这给阅读带来了一定的难度。这些词其实叧需要把它们当作符号来理解，而 真正的理解难点在preformed chemicals、highly effective deterrents to insects 等短语。 要理解这些短语，需要我们在做阅读时丌断积累，并丏多查词典掌握其用法。阅读中语法比 较难的句子叧占少数，大部分情况下单词和短语都认识，句子意思就能读懂了。所以，我们 在做阅读乊前一定要背好单词，积累常用短语。 【参考翻译】 如果植物的物理障碍被突破，那么准备好的化学物质就能阻拦戒杀死入侵者，植物组织也含 有各种有毒戒潜在有毒的物质，比如树脂、单宁酸、配糖和生物碱，这些物质对以植物为食 物的昆虫来说是巨大的威胁。 【成分划分】 状语从句 老杜托福100 句 （五） The physical barriers[主语] of the plant[定语] are breached[谓语]. 并列句 Preformed chemicals[主语] may inhibit[谓语] or[连接词] kill[谓语] the intruder[宾语]. 并列句 Plant tissues[主语] contain[ 谓语] a diverse array of toxic or potentially toxic substances[宾语], such as resins, tannins, glycosides, and alkaloids[同位语]. 定语从句 Many of them[主语] are[系动词] highly effective deterrents[表语] to insects[定语] . 定语从句 Insects[主语] feed on[谓语] plants[宾语]. 句子2 Immediately adjacent to the timberline, the tundra consists of a fairly complete cover of low-lying shrubs, herbs, and grasses, while higher up the number and diversity of species decrease until there is much bare ground with occasional mosses and lichens and some prostrate cushion plants. 【难点解析】 本句难点在于大量的与有名词以及考生们比较陌生的词组用法，如：“a fairly complete 老杜托福100 句 （五） cover of”“while higher up”。而丏，“consists of…”的特殊用法也容易影响理解句意。 在句子分析的过程中，可以通过引导词 while （通常作为对比关系连接词），以及 “