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有一个边长为2a的正三角形，将其各边中点相连得到第二个三角形，那么连接到第四次时。得到的三角形

的面积为（）。

有一个边长为2a的正三角形，将其各边中点相连得到第二个三角形，那么连接到第四次时。得到的三角形的面积

有一个边长为2a的正三角形，将其各边中点相连得到第二个三角形，那么连接到第四次时。得到的三角形的面积

有一个边长为2a的正三角形，将其各边中点相连得到第二个三角形，那么连接到第四次时。得到的三角形的面积

有一个边长为2a的正三角形，将其各边中点相连得到第二个三角形，那么连接到第四次时。得到的三角形的面积

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第2题

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第3题

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第4题

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第5题

听力原文：W: Professor Smith has a class this afternoon from 2:30 to 4. But he won't be abl

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第6题

听力原文：M: Professor Smith certainly has a good reputation in the Department of English.W

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