单项选择题
A.append(content)B.appendTo(content)C.insertAfter(content)D.after(content)
A.parent()B.children()C.next()D.contents()
A.$("#box li").css(’background’,"red");B.$("#box li.active").css(’background’,"red")C.$("#box li:first").css(’background’,"red");D.$("#box li").eq(0).css(’background’,"red");