— Do you think I should get a good guidebook?

— Yes, of course. _____, you also need a good camera and comfortable shoes. [ ]

A. In other words

B. By the way

C. What's more

D. All in all

1902年通过的“______”学制，基本参照美国的学制，通常又称“______”学制，这是旧中国使用时间最长的学制。