Diamonds that are flawed or are too small for jewelry are used to cut very hard metals.

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问题 Diamonds that are flawed or are too small for jewelry are used to cut very hard metals.

选项 A、tiny
B、imperfect
C、luminous
D、crude

答案B

解析 划线词are flawed“有缺陷的”。A项tiny“微小的”;B项imperfect“有缺点的”;C项luminous“发光的,明亮的”;D项crude“天然的”。显然,B项与之语意符合。
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