无痛性便血，直肠指诊基本正常为（）。
A．内痔
B．外痔
C．肛裂
D．直肠息肉
E．直肠癌
参考答案：A
What would you like to ______ us about your hometown?[ ]
A. speak
B. talk
C. say
D. tell
其他含有青霉素或链霉素的混合药
