______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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