After two months' hard work, the workers managed to connect the two towns        railway. [ ]

A. under

B. by

C. in

D. up

男性，10岁。右大腿下端疼痛肿胀，皮温增高，伴高热达39．5℃1天，怀疑为急性化脓性骨髓炎。

体格检查有力的证据是（）

A.右股骨下端皮温升高

B.右股骨下端（干骺端）深压痛

C.右股骨下端肿胀

D.局部血管充盈怒张

E.右膝关节伸屈受限