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  3. Pure feldspar is a colorless,transparent

Pure feldspar is a colorless,transparent

Loveyou2019-12-17  7
问题 Pure feldspar is a colorless,transparent mineral,but impurities commonly make it opaque and colorful.
选项 A:truly B:rapidlyC:periodically D:frequently
答案D
解析本句意思：纯长石是一种无色、透明的矿物质，但杂质通常使它变得不透明还五颜六色的。commonly意思是“通常地”，与frequently（经常地，频繁地）意思相近。truly真实地，确实地；rapidly迅速地；periodically定期地。
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