单项选择题 The author's primary purpose in the passage is to（）

单项选择题 Molds were once used only for small amounts of fat, shared with neighbors at cooperative candle dippings or supplied by （） candle makers who canvassed large geographical areas.

单项选择题 Although he had been many times given the caveat emptor, Feldman purchased paintings and（） in quantity, often without （） them first.