-2023- 08/28

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He indicated a semicir
单选题 He indicated a semicircle with a______of about thirty miles.

A.radius

B.radium

C.radiation

D.radar

正确答案: A

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答案解析: 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指化学元素错;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。

相关知识:一、词汇和语法 

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