FLOAT测试

<style type="text/css">
#wrap{width:300px;height:300px; margin:20px auto;}
#a,#b,#c{float:left;}
#a{width:100px; height:200px; background-color:#999;}
#b{width:200px; height:100px; background-color:#f00;}
#c{width:100px; height:100px; background-color:#fc0;}
#d{width:100px; height:200px; background-color:#03c; float:right;}
#e{width:200px; height:100px; background-color:#0f0; float:right;}
<!--  以上为测试题的CSS --->
#menu{width:750px; margin:10px auto; height:30px; text-align:center;}
</style>
<div id="wrap">
<div id="a"></div>
<div id="b"></div>
<div id="c"></div>
<div id="d"></div>
<div id="e"></div>
</div>
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