2. 外语
  3. Frequent exposure to X-ray is harmful, so the use of X-ray should be limited to occasions when______.

Frequent exposure to X-ray is harmful, so the use of X-ray should be limited to occasions when______.

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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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大学英语四级

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