考点解析
主旨题要求考生概括文章核心内容，高频提问形式：
What is the main idea of the passage?
The passage is mainly about...
The best title for the passage is...
解题技巧：
定位主题句：通常出现在首段、段落首句/末句，或转折词后（如however, but）。
排除干扰项：错误选项常为细节信息或片面观点。
例题：
Passage: "The rise of social media has revolutionized communication... However, studies show excessive use may lead to mental health issues..."
Q: What is the main idea?
A) Social media improves communication.
B) Social media has both benefits and risks.
C) Mental health issues are caused by technology.
答案：B
分析：原文通过however对比社交媒体利弊，B项全面概括；A、C均为片面细节。
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