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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The population of Seattle is a conglomerate of people from different ethnic and cultural backgrounds.
A. a company
B. a fluctuation
C. an assortment
D. a matching
单项选择题
Theodere Dreiser was one of the first American novelists to portray immoral characters without condemnation.
A. hostility
B. sadness
C. blame
D. pity
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