单项选择题
A、<meta http-equiv=”refresh”content=”1”> B、<meta http-equiv=”expires”content=”60”> C、<meta http-equiv=”expires”content=”1”> D、<met ahttp-equiv=”refresh”content=”60”>
A、<STYLE TYPE="text/css">H1{color:blue}H1{font-family:Arial}</STYLE> B、<STYLE TYPE="text/css">H1{color:blue;fontface:Arial}</STYLE> C、<STYLE TYPE="text/css">H1{color:blue;font-family:Arial}</STYLE> D、<STYLE TYPE="text/css">H1{color:blue}H1{fontface:Arial}</STYLE>
A.A:hover{text-decoration:none;} B.A:hover{text-decoration:underline;} C.A:hover{text-align:none;} D.A:hover{text-align:underline;}