18.C 细节理解题。根据第五段“I'm working for my masters (the family) and already have four credits (all daughters).”和第六段“upstairs I could hear our new experimental model (6 months) in the childdevelopment program”可判断,她有四个女儿,最小的女儿仅有6个月大。
19.B 细节理解题。根据最后两段的最后一句,即“The rewards are in satisfaction rather than just money.”和“I felt successful.”,可判断,作者对自己做家庭妇女的工作是满意而有着成功感的。
20.D 推理判断题。作者从第二段开始讲述自己在市政厅发生的故事,她将自己家庭妇女的工作诙谐地比作是儿童发展及人事关系研究助理员的工作,将女儿比作“credits”、“lab assistants”和“new experimental model”,可见其幽默。