A.border-radius:20px B.border-bottom-right-radius:10px C.border-top-left-radius:20px D.以上都不對(duì)
A.li:first-child{color:red;} B.li:last-child(1){color:red;} C.li:nth-child(odd){color:red;} D.li:nth-last-child(5){color:red;}
A.width:15; B.width:60px; C.height:100%; D.height:100;