2. 外语
  3. ______is the length of the closed curve of a circle.

______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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