在英语四级考试中，阅读理解是一个非常重要且占比较大的部分。为了顺利应对这一部分的考试，掌握扫读和略读的技巧是必不可少的。本文旨在介绍扫读和略读技巧，并提供相关实例加以说明。
一、扫读技巧
1. 阅读题目先行
2. 目光迅速跳读
扫读的目标是快速了解文章的主要内容，因此我们需要快速地浏览每个段落的开头和结尾，出文章的主旨句和核心信息。同时，通过目光迅速跳读，我们可以更加快捷地到与题目相关的内容。
3. 利用标题和段落标记
文章的标题和段落标记通常能提供非常有用的信息。通过仔细阅读标题和段落标记，我们可以更好地理解文章的结构和段落之间的逻辑关系。
二、略读技巧
1. 整体了解
略读的目的是了解文章的大意和整体结构，因此我们需要从容分析文章的开头、结尾以及各个段落的主题句。通过了解文章的整体框架，我们可以更有针对性地到所需信息。
2. 留意关键词
略读时，我们要注意留意文章中的关键词和高频词。这些词能够帮助我们快速到文章的重点信息，提高阅读效率。
3. 排除干扰项
略读时，我们需要迅速排除一些干扰项，只关注与问题相关的部分。通过略读的技巧，我们可以更快地到答案，节省时间。
英语四级技巧实例：
阅读以下短文，然后根据题目要求进行问题解答。
Today's world is highly connected. With the development of technology, we can get access to information from all over the world easily and conveniently. However, this also brings challenges to our reading ability. We are exposed to a large amount of information every day, and it is crucial for us to read efficiently.
One effective reading technique is skimming. Skimming refers to quickly looking through the text to get a general idea of the content. It involves reading the title, headings, and the first and last sentence of each paragraph. By doing so, we can grasp the main points without reading the entire text. Skimming is especially useful when we need to find specific information quickly, such as when we are looking for a particular fact or a certain piece of information.
Another useful reading technique is scanning. Scanning means searching the text for specific keywords or phrases. In scanning, we move our eyes rapidly across the lines of text, looking for the information we need. For example, when we are reading a newspaper article to find a statistic, we can scan for numbers or percentages. Scanning helps us locate information accurately and efficiently.
In conclusion, the skills of skimming and scanning are indispensable for effective reading. Skimming allows us to quickly get the general idea of the text, while scanning helps us locate specific information. By mastering these techniques, we can significantly improve our efficiency in reading and better cope with the challenges of the information era.
根据上文，回答以下问题：
1. What is skimming?
2. When is scanning most useful?
3. Why are skimming and scanning important in today's world?
解答：
1. Skimming is a reading technique that involves quickly looking through the text to get a general idea of the content. It includes reading the title, headings, and the first and last sentence of each paragraph.
2. Scanning is most useful when we need to find specific information quickly. For example, when we are looking for a particular fact or a certain piece of information.
3. Skimming and scanning are important in today's world because they allow us to efficiently handle the vast amount of information we encounter every day. They help us quickly grasp the main points of a text and locate specific information, saving time and improving overall reading efficiency.
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