托福阅读长难句是困扰很多考生的问题，很多同学因为看不懂句子导致失分严重。下面前程百利小编给大家搜集了几个托福阅读长难句，并对每一个句子进行了精析，最后还有意群训练供大家练习和巩固。大家一起来看一下吧。
1. Normally, the constantly changing levels of an animal's activity—sleeping, feeding, moving, reproducing, metabolizing, and producing enzymes and hormones, for example—are well coordinated with environmental rhythms, but the key question is whether the animal's schedule is driven by external cues, such as sunrise or sunset, or is instead dependent somehow on internal timers that themselves generate the observed biological rhythms.
难句类型：插入成分+冗长修饰
本句的插入成分多而且长，但是对付他们的办法非常简单，就是跳过去，先读主干，本句主干是the constantly changing levels of an animal's activity arewell coordinated with environmental rhythms, but the key question is whether the animal's schedule is driven by external cues，所以本句的核心意思就是动物活动经常变化的水平是和环境节奏相协调的，但是关键的问题是动物的节奏是否由外界因素决定的。such as引导成分直到句子结束都是次要的成分，同学们读的时候只要扫一眼就行了。.
译文：
通常地，动物活动，如睡眠，进食，移动，繁殖，新陈代谢和酶和激素的分泌等活动的持续变动水平是一直和环境变化的节奏保持一致的，但有一个关键的问题是：生物钟表是由外界因素，如日出日落，影响，还是自身内在的生物钟决定的?
意群训练：
Normally, the constantly changing levels of an animal's activity— sleeping, feeding, moving, reproducing, metabolizing, and producing enzymes and hormones, for example— arewell coordinated with environmental rhythms, but the key question is whether the animal's schedule is driven by external cues, such as sunrise or sunset, or is instead dependent somehow on internal timers that themselves generate the observed biological rhythms.
2. Indeed, stability of the biological clock's period is one of its major features, even when the organism's environment is subjected to considerable changes in factors, such as temperature, that would be expected to affect biological activity strongly.
难句类型：复杂修饰+插入成分
本句的主句结构其实特别简单就是stability is one of its major features, even when引导的状语从句the organism's environment is subjected to considerable changes in factors,然后用such as引导了列举temperature,之后再用that引导从句来说明temperature would be expected to affect biological activity strongly.
译文：
事实上，即使有机体受到外界因素，如温度，强烈改变的影响，有机体内生物钟的稳定性是影响生物活动的一个主要因素。
意群训练：
Indeed, stability of the biological clock's period is one of its major features, even when the organism's environment is subjected to considerable changes in factors, such as temperature, that would be expected to affect biological activity strongly.
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