请根据对话内容，从下面方框中所给的选项中选出合适的句子补全对话。其中有一项是多余的。 请把正确的代号填到横线上。

A: Good morning, Doctor.

B: Good morning, young man. ____

A: I've got a headache and a cough. I'm sure there is something wrong with me.

B: ____

A: Since last week.

B: ____

A: I'm feeling even worse now.

B: Don't worry. Let me check your body. Oh, you feel a little hot. ____ 

A: Yes, I have a fever.

B: I'm afraid you have caught a cold. ____ Have a good rest and you'll feel better soon.

A: Thank you, Doctor.

B: That's all right.

已知f（n）=1+3+5+…+（2n﹣5），且n是大于2的正整数，则f（10）= ____．

——《国史概要》

材料二 明清时期人口大幅度增加的过程中，牛耕大量退出，唐宋时期代表先进生产力的江东犁，到明清时已被铁搭所取代。铁搭用人，而江东犁用牛。《天工开物》记载：“吴郡力田者，以锄代耜，不蓄牛力。会计牛值与水草之资，窃盗死病之变，不若人力之便。”(注：铁搭：农具名。有4至6个略向里弯的铁齿，用于刨土)

——《太湖地区农业史》

图1