乙型溶血性链球菌感染( )
A．经淋巴系统传播 B．生殖器黏膜上行传播 C．经血液循环传播 D．直接蔓延 E．垂直传播
参考答案：A
外汇呆账是指债务人逾期未履行偿债义务超过三年，确定不能收回的外汇资金。 ( )
A ______ has been launched by the netzens on the Net to get rid of unhealthy information which does
harm to young students. [ ]
A. struggle
B. campaign
C. fight
D. battle
