<p><span style="margin: 0px; padding: 0px; border: 0px; font-family: 微软雅黑; font-size: 12px; color: rgb(102, 102, 102); background-color: rgb(255, 255, 255);">富于变化</span><span style="margin: 0px; padding: 0px; border: 0px; font-family: 微软雅黑; font-size: 12px; color: rgb(102, 102, 102); background-color: rgb(255, 255, 255);">难度适中</span><span style="margin: 0px; padding: 0px; border: 0px; font-family: 微软雅黑; font-size: 12px; color: rgb(102, 102, 102); background-color: rgb(255, 255, 255);">连贯紧凑</span></p>