单项选择题
A.H1#color_red{color:red} B.H1,H2{color:red} C.H1 B{color:red} D.A:active{color:red}
A.<INPUT type="radio"> B.<INPUT type="paassword"> C.<INPUT type="checkbox"> D.<INPUT>
A.<FRAMESET rows="*,3*"> B.<FRAMESET rows="*,2*"> C.<FRAMESET cols="*,3*"> D.<FRAMESET cols="*,2*">