            <li class="nav-item"><a href="/knowledge">环保知识</a></li>
                <li class="nav-item"><a href="/process">垃圾处理流程</a></li>
                <li class="nav-item active"><a href="/quiz">环保测验</a></li>
                <li class="nav-item"><a href="/tips">减废技巧</a></li>
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    <div class="content-container">
        <h1>环保知识挑战</h1>
        <p class="quiz-intro">测试你的垃圾分类和环保知识，赢取