实现效果：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
*{ margin:0px; padding:0px;}
div{ width:798px; height:198px; text-align:center; margin:0 auto;}
p{ width:190px; height:175px; background:#999999; display:inline-block; line-height:190px;}
</style>
</head>
<body>
<div>
<p>第1个标题</p>
<p>第2个标题</p>
<p>第3个标题</p>
<p>第4个标题</p>
</div>
</body>
</html>
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