In this country, employees are to retire when they reach the age of 60.

【官方標示為正解】fertile 意為「肥沃的、能生育的」(fertile land 肥沃土地、fertile mind 富創造力的頭腦),依英文語意與「年滿 60 歲退休」無關。本題官方答案疑有誤,語意上應為 C. eligible。應試時請以官方答案為準,但學習時請記住 eligible to retire 才是正確搭配。