直肠上静脉丛和直肠下静脉丛在何处互相交通()
A.齿线附近
B.肛门皮下
C.肛管
D.肛门白线附近
参考答案:D
Most of the work was done by my sister and _______.[ ]
A. me
B. I
C. my
D. Mine
简述发热的表现及特点。