Galena, the chief ore of lead, is a brittle mineral with a metallic luster.

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问题 Galena, the chief ore of lead, is a brittle mineral with a metallic luster.

选项 A、hazel
B、dense
C、breakable
D、sparking

答案C

解析 brittle脆的,易碎的。breakable易破坏的,脆的。hazel淡褐色的。dense密集的。sparking发出火花的,闪光的。
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