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The origin of silk production in central China can at least partially be because of the reason that the warm and humid climate is suitable for the cultivation of mulberry trees, the silkworm’s primary food source.

  • A

    The origin of silk production in central China can at least partially be because of the reason that

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  • B

    Silk production having originated in central China, one reason is

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  • C

    That silk production originated in central China is, at least partially, the reason

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  • D

    One reason that silk production originated in central China is that

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  • E

    Silk production originated in central China, with one reason for this being

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正确答案: D

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