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Frequent exposure to X-ray is harmful, so the use of X-ray should be limited to
Frequent exposure to X-ray is harmful, so the use of X-ray should be limited to
游客
2024-02-22
13
管理
问题
Frequent exposure to X-ray is harmful, so the use of X-ray should be limited to occasions when______.
选项
A、primary
B、elementary
C、necessary
D、emergent
答案
C
解析
形容词辨义。primary意为“最初的,主要的”,如:a matter of primary importance(头等重要大事);elementary意为“初步的,基本的”,如:an elementary reading book for a child who is learning to read(为识字儿童编写的初级读物);necessary意为“必要的,必需的”,如:Cars are a necessary part of life.(汽车是生活中的一个必不可少的组成部分。)emergent意为“紧急的,突然出现的”,如:an emergent political leader(一位新出现的政治领袖)。根据题意可知,应选C)。
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