单项选择题

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

A.truly
B. rapidly
C. periodically
D. frequently

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单项选择题
The train came to an abrupt stop, making us wonder where we were.()

A. slow
B. noisy
C. sudden
D. jumpy
单项选择题
Eventually,she got a job and moved to London.()

A. Finally
B. Certainly
C. Luckily
D. Naturally
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