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WJCorrection status：qualified
Teacher's comments：写的不错，下次一天的作业合在一块写！
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<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>结构伪类选择器：分组（不区分元素类型）</title><style>/* 分组结构伪类分二步 *//* 元素按组分 *//* 在分组中根据索引进行选择、 */.h3-title span:last-of-type {background-color: rebeccapurple;}/* 在分组中匹配任何一个 */.h3-title span:nth-of-type(3) {font-size: 40px;}/* 前3个 */.h3-title span:nth-of-type(-n + 3) {color: red;}/* 最后三个 */.h3-title span:nth-last-of-type(-n + 3) {color: blue;}</style></head><body><div class="h3-title"><div class="wsp">我是第1行</div><div class="wsp">我是第2行</div><div class="wsp">我是第3行</div><span class="wsp">我是第4行</span><span class="wsp">我是第5行</span><span class="wsp">我是第6行</span><span class="wsp">我是第7行</span><span class="wsp">我是第8行</span><span class="wsp">我是第9行</span></div></body></html>