◎ 题干
His mother is ______. Today is his mother’s thirtiethbirthday.
A. thirteen         B. thirty          C. Thirtieth
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“His mother is ______. Today is his mother’s thirtiethbirthday.A. thirteen B. thirtyC. Thirtieth…”主要考查了你对  【基数词】【序数词】【时刻】【分数】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。