Intended primarily to stimulate family summer travel, the new airfare, which allows both an adult and a child to fly for the price of one ticket, and also shortens the advances-purchase requirement for family travel to a minimum of seven days rather than fourteen.
Answer: E
(C) also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than that of (E) also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than
觉得“a minimum of seven days ”中要比较的"seven days",而不是minimum。因为比较更注重 7天 和 14天 的不同。也许可以说 A of B 结构里 A 是中心词,不过不太适合这个情况,这里的 minimum 就是 7天 本身。退一步说,不加 "that of", 7天 比 14天 的意思是很明确和简练了。
以下是引用1stzhang在2003-8-19 0:17:00的发言: 比如: Summer is hotter than in Beijing than in dalian. 但是不可以说:Summer is hotter than in Beijing than dalian。因为in...是一个完整的成分