一、单选题（每题2分，共20分）\n1. HTML中，用于定义网页标题的标签是（ ）\nA.
B. <head> C. <h1> D. <meta>\n答案：A\n解析：<title> 标签定义文档的标题，显示在浏览器标签页上。\n\n2. 在CSS中，要使文本水平居中，下列哪个属性正确？（ ）\nA. align: center B. text-align: center C. margin: auto D. both a and c\n答案：B\n解析：CSS中文本水平居中使用 text-align: center；margin用于元素居中而非文本。\n\n3. 下列哪个DOCTYPE声明符合HTML5规范？（ ）\nA. <!DOCTYPE html> B. <!DOCTYPE HTML PUBLIC \</p>
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