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Pure feldspar is a colorless,transparent mineral,but impurities commonly make it opaque and colorful.
A:truly
B:rapidly
C:periodically
D:frequently
B:rapidly
C:periodically
D:frequently
参考答案
参考解析
解析：本句意思：纯矿石是一种无色、透明的矿物质，但里面的杂质通常使它变得不透明而且 还五颜六色的。toly的意思为“真实地，确实地”;rapidly的意思为“迅速地”;periodically的意 思为“定期地”;frequently的意思为“经常地，频繁地”。commonly的意思为“通常地”，和 frequently的意思接近。
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