单选题 As______rule, oranges are sold by______weight and eggs by______ dozen.
【正确答案】 A
【答案解析】[解析] as a rule意为“通常地”是固定词组;在度量名词前,表示付工资、卖、租等方式时,用the,如paid by the hour(day,month,piece…),sold by the yard(dozen,ton…),但by weight意为“按重量”。