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【单选题】
下列关于CSS语法规则的描述错误的是A.
CSS的规则由选择器和声明两部分构成,选择器包括标签选择器、ID选择器和类选择器等
B.
声明必须放在大括号{}中,声明可以是一条,也可以是多条
C.
每一条声明结束,以冒号结尾,最后一条语句的冒号不可以省略不写
D.
每一条声明由属性和值组成
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