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

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

admin2012-07-29  63
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 通常地
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