①废丞相，设三司 ②八股取士 ③设立特务机构 ④设立军机处 ⑤大兴文字狱．

历史学家科林伍德看来：历史中遗失最多的大概就是问题(question)，历史人物往往把种种回答留下了(这便是文物、文献)，却将自己内心中的问题，尤其是那些自己还没有能力回答的问题带进了坟墓。因此历史学家最重要的任务便是根据留下的答案去追溯、重构已失去的问题。科林伍德强调历史学家的任务是(  )

根据短文理解选择答案。

      The students start arriving on our playground from about 8:45 am. Most of our children walk but some travel to school by car.

      The children wear a school uniform and carry their homework and lunch in a school bag.

      School begins at 8:55 a.m. The duty teacher blows a whistle and the children line up in their class groups. They wait quietly for the teacher to send them to their classrooms.

      On arriving in their classrooms, the children empty their bags and put their homework in the marking boxes. The children then go back into their classrooms.

      The children do their early morning work while their class teacher takes the attendance register(考勤簿).The teacher reads out each child’s name in turn. At 9:10 a.m., the children go to assembly in our main hall. They sit on the floor in rows with the youngest children at the front and the older children at the back. As the children go into the hall, they listen quietly to the music playing.