A row of upright fan-shaped plates running down the spine provided the Stegosaurus dinosaur with an especially efficient solar heating and cooling system to allow them to move comfortably through different climatic regions.
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Ato allow them to move comfortably
分析该选项
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Bto allow it a comfortable movement
分析该选项
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Cthat allowed it to move comfortably
分析该选项
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Dthat allowed their comfortable movement
分析该选项
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Eallowing them to move comfortably
分析该选项