◎ 题干
—What’s this? 
—It’s a machine which was invented in __________century in China.
A.sixB.sixthC.the sixD.the sixth
◎ 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“ —What’s this?—It’s a machine which was invented in __________century in China.A.sixB.sixthC.the sixD.the sixth…”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。