A.ul li b{color:blue;} B.h1 span{color:red;} C.div em{color:red;} D.a,b{color:red;}
A.ul li{color:blue} B.h1,p,div{color:red} C..cl,#box{color:red} D.p{color:red}
A.red B.blue C.redblue D.bluered