1.
（1）exam1.css文件：
.s1 {
font-size: 50px;
color: blue;
}
.s2 {
backgoround:gray;
font-style: italic;
color: red;
}
.s3 {
background-color: gray;
}
（2）exam1.html文件
<!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=utf-8" />
<title>exam1.html</title>
<link rel="stylesheet" type="text/css" href="./exam1.css" />
</head> <body>
<font class="s1">梁山排行榜</font> <br/><br/>
<span class="s2">宋江</span> <br/><br/>
<span class="s3">卢员外</span> <br/><br/> </body>
</html>