He indicated a semicircle with a ______of about thirty miles.A、radiusB、radiumC

游客2023-12-30 30

问题 He indicated a semicircle with a ______of about thirty miles.

选项 A、radius
B、radium
C、radiation
D、radar

答案 A

解析这句话的意思是：他标示出了一个半径大约为30英里的半圆形。radius意为“半径、范围”；radium指化学元素镭；radiation意为“辐射、发射”；radar意为“雷达、无线电探测器”。根据句意，选项A为正确答案。

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