Question

15. As_____ rule, apples are sold by  _____ weight and eggs by _____ dozen.

  A. a; 不填；the            B. a; the; the

  C. a; a; the               D. the; 不填；不填

Answer 1

A

解析:

选A。as a rule(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, moth, piece…), sold by the yard (dozen, ton…)，比较by weight (按重量)。