Pure feldspar is a colorless, transparent mineral,but impurities commonly make it opaque and colorful.

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问题 Pure feldspar is a colorless, transparent mineral,but impurities commonly make it opaque and colorful.

选项 A、truly
B、rapidly
C、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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