As we trace back toward epochs when the universe was younger, we come to the stage when the______ radiation originated.

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问题 As we trace back toward epochs when the universe was younger, we come to the stage when the______ radiation originated.

选项 A、preposterous
B、perpendicular
C、precarious
D、primordial

答案D

解析 本题考查形容词辨析。preposterous意为“荒谬的,愚蠢可笑的”。perpendicular意为“垂直的,成直角的”。precarious意为“危险的,不稳定的”。primordial意为“原始的,原生的”。根据epochs when the universe was younger(当宇宙比较年轻时期)判断,在此讲的radiation(放射物)应是原始的、古老的,故[D]项符合题意,为答案。
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