女性尿路感染最常见的途径是（）
A.直接感染
B.下行感染
C.逆行感染
D.淋巴感染
E.血行感染
参考答案：C
The number of people who were invited ____ fifty, but a few of them ____ absent for different reasons.[ ]
A. were; was
B. was; was
C. was; were
D. were; were
简述组织职能式结构的特点。
