How to add a background to all of the < h1 > tag color?
A、.h2{background-color:#FFFFFF}
B、h1{background-color:#FFFFFF;}
C、h2.all{background-color:#FFFFFF}
D、#h2{background-color:#FFFFFF}
发布时间：2025-08-03 19:26:23
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答案：B
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