2-7:在boxfour里面添加了display：block，这个是转化成块状元素，可以消除间隙吗？
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{margin:0;
padding:0;
}
.boxone{background:black;
width:100%;
height:100px;
position:absolute;
overflow:hidden;
top:0;
}
.boxthree ul li{
line-height:100px;
list-style:none;
float:left;
margin-right:30px;
color:white;
font-weight:bold;
}
.boxthree{float:right;}
.boxfour img{
display:block;
width:100%;}
.boxfour{
padding:100px 0;
}
.boxfive{
width:100%;
background:black;
height:100px;
line-height:100px;
color:white;
position:fixed;
bottom:0;
}
.boxfive ul{
width:100%;
text-align:center;
}
.boxfive li{
display:inline-block;
line-height:100px;
margin:0 15px;
}
</style>
</head>
<body>
<div class="boxone">
<div class="boxtwo">
<img src="http://img1.sycdn.imooc.com/climg//58c0d2d900016ce303000100.png"></div>
<div class="boxthree">
<ul>
<li>课程
<li>职业路径</li>
<li>实践</li>
<li>猿问</li>
<li>手记</li>
</ul>
</div>
</div>
<div class="boxfour">
<img src="http://img1.sycdn.imooc.com/climg//58c0eda50001e12416000480.jpg">
<img src="http://img1.sycdn.imooc.com/climg//58c0edb80001c9f216000480.jpg">
<img src="http://img1.sycdn.imooc.com/climg//58c0edc9000100d516000480.jpg">
</div>
<div class="boxfive">
<ul>
<li>网站首页</li>
<li>企业合作</li>
<li>人才招聘</li>
<li>联系我们</li>
<li>常见问题</li>
<li>友情链接</li>
</ul>
<span>课程</span>
<span>职业路径</span>
</div>
</body>
</html>
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