要想做好GMAT阅读题，我们首先得学会 “不读什么”

GMAT 阅读颇具讽刺意味的一点是：要想做好阅读题，我们首先得学会 “不读什么”。这次将采用OG中的真题，做一个演练。

All of the cells in a particular plant start out with the same complement of genes. How then can these cells differentiate and form structures as different as roots, stems, leaves, and fruits? The answer is that only a small subset of the genes in a particular kind of cell are expressed, or turned on, at a given time. This is accomplished by a complex system of chemical messengers that in plants include hormones and other regulatory molecules. Five major hormones have been identified: auxin, abscisic acid, cytokinin, ethylene, and gibberellin. Studies of plants have now identified a new class of regulatory molecules called oligosaccharins.

Unlike the oligosaccharins, the five well-known plant hormones are pleiotropic rather than specific; that is, each has more than one effect on the growth and development of plants. The five has so many simultaneous effects that they are not very useful in artificially controlling the growth of crops. Auxin, for instance, stimulates the rate of cell elongation, causes shoots to grow up and roots to grow down, and inhibits the growth of lateral shoots. Auxin also causes the plant to develop a vascular system, to form lateral roots, and to produce ethylene.

The pleiotropy of the five well-studied plant hormones is somewhat analogous to that of certain hormones in animal. For example, hormones from the hypothalamus in the brain stimulate the anterior lobe of the pituitary gland to synthesize and release many different hormones, one of which stimulates the release of hormones from the adrenal cortex. These hormones have specific effects on target organs all over the body. One hormone stimulates the thyroid gland, for example, another the ovarian follicle cells, and so forth. In other words, there is a hierarchy of hormones.

Such a hierarchy may also exist in plants. Oligosaccharins are fragments of the cell wall released by enzymes: different enzymes release different oligosaccharins. There are indications that pleiotropic plant hormones may actually function by activating the enzymes that release these other, more specific chemical messengers from the cell wall.

计时 3 分钟阅读该文章并做笔记：若超时未读完，记录额外所需时间，完成后再回到本文。

各段落阅读策略：聚焦核心，跳过细节

第一段：90% 聚焦，10% 略读

阅读开篇段落时，核心目标是：

识别复杂词汇 / 句子成分，暂时忽略；

判断何时从精读切换到略读；

明确何时需重新集中注意力。

段落核心：

All the cells in a particular plant start out with the same complement of genes. How then can these cells differentiate and form structures as different as roots, stems, leaves, and fruits? The answer is that only a small subset of the genes in a particular kind of cell are expressed, or turned on, at a given time. This is accomplished by a complex system of [things] that in plants include [some stuff].

阅读标注逻辑：

普通文本：正常阅读，无需额外关注；

粗体：重点关注内容（大脑主动集中注意力）—— 注意：未标注任何复杂词汇，即使是难度中等的词；

划线删除：形式上读过（眼睛扫过），但快速略过 —— 不思考含义或上下文关联，避免大脑过度参与；

[括号内内容]：暂时无需理解的难词 / 概念，此时可开始更大胆地略读。

关键判断依据：

优先捕捉简单词汇传递的核心信息：无需纠结专业术语（如 differentiate、expressed），原文随后会给出解释（分化 = 形成不同结构，表达 = 激活）；

细节信息（如调控系统的具体类型、化学信使的属性）暂时跳过，开篇只需把握主旨；

识别列举信号：看到 “Auxin（生长素）” 后意识到后续是 5 种激素的列表，直接跳过；

关注高价值信号词：看到 “Studies have now identified something new” 时重新集中注意力，提炼核心 ——“已知 5 种激素 + 新发现的寡糖素（Oligosaccharins）”。

小结：第一段通常需要 90% 的聚焦度，后续段落可逐步提升阅读速度。

第二段：60% 聚焦

Unlike the oligosaccharins, the five well-known plant hormones are pleiotropic rather than specific; that is, each has more than one effect on the growth and development of plants. The five have so many simultaneous effects that they are not very useful in artificially controlling the growth of crops. Auxin, for instance

阅读策略：

精读前两句核心逻辑：寡糖素与 5 种激素的差异 ——5 种激素 = 多效性（有多种作用），寡糖素 = 特异性（反推可知：单一作用）；

略读信号词后的细节：看到 “for instance”（例如）即判断后续为具体例子，无需精读，仅需知道是在支撑 “5 种激素多效性” 的观点。

第三段：40% 聚焦

The pleiotropy of the five well-studied plant hormones is somewhat analogous to that of certain hormones in animals. For example, hormones from the hypothalamus [blah blah detail blah]

阅读策略：

识别举例信号：开篇 “For example” 表明后续为细节，快速略读；

捕捉高价值信号词：看到 “In other words”（换句话说）时暂停略读，聚焦核心结论 ——“激素存在层级结构（hierarchy）”；

利用常识辅助理解：若不熟悉 “hierarchy”，可联想 “公司层级”（CEO→副总裁→经理），快速把握 “激素间存在调控关系” 的核心。

第四段：20% 聚焦

Such a hierarchy may also exist in plants. Oligosaccharins are fragments

阅读策略：

精读首句核心观点：“植物体内可能也有激素层级结构”；

后续内容均为细节补充，直接略读。

注意：各段落聚焦比例仅为参考（非固定规则），需根据文章信号灵活调整。通常越往后读，略读比例越高，但如果最后一段出现总结性观点，仍需适当聚焦。

笔记示例（简洁为主，因人而异）

笔记核心原则：

极度简洁：无需记录细节，仅保留主旨和定位关键词；

明确定位：知道 “动物相关” 在 P3、“Auxin” 在 P2，便于做题时快速回文；

接受 “未知”：初期阅读无需掌握所有信息，细节可在做题时再补充。

关键问题：真的只需掌握这些吗？

是的！原因如下：

时间限制：GMAT 阅读无法逐字精读，需优先把握框架；

问题导向：并非所有细节都会考查，仅当题目涉及某一细节时，再回文精读该部分即可 —— 初期阅读的核心是 “延迟处理细节”，而非 “放弃细节”。

核心要点：哪些内容绝对不要读？

1. 专业术语 / 难词可略读，优先找解释

原文出现的技术术语（如 expressed、pleiotropy）或生僻词，几乎都会用简单语言解释（如 “or turned on”“rather than specific”），无需浪费时间纠结词义，直接找后续的通俗说明。

2. 词汇量仍需达标

虽然难词会有解释，但基础词汇（如 analogous、hierarchy）需要提前掌握。若遇到未被解释的陌生词，需及时积累，避免影响理解。

3. 识别信号词：区分 “核心观点” 与 “细节”