________is the length of the closed curve of a circle.

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问题 ________is the length of the closed curve of a circle.

选项 A、Radius
B、Diameter
C、Dimension
D、Circumference

答案D

解析名词辨析题。circumference意为“圆周；周长”，符合句意，故D为答案。radius意为“半径；半径范围”；diameter意为“直径”；dimension意为“维；尺寸”。

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专业英语四级

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