21. These goods are of good _____ .
A. qualities B. quantity
C. quality D. quantities
【解析】选C。考查名词辨析。quantity表示“数量”，与句意不符。quality表示“质量”。“of+形容词+名词”相当于一个形容词。句意：这些货物质量不错。故应选C。
22. She gave me a _____ look, —the kind that said she would not change her mind.
A. peaceful B. frightened
C. generous D. determined
