便后肛门部肿物，疼痛明显者为
A．腹痛、发热、黄疸B．水量便鲜血C．出血伴腹痛高热D．出血速度慢、便血为主E．出血速度快、呕血或便血
参考答案：B
______ was the first Chinese astronaut to walk in space. [ ]
A. Yang Liwei
B. Fei Junlong
C. Nie Haisheng
D. Zhai Zhigang
光辉带
