治疗钩端螺旋体病应首选（）。
A.青霉素G
B.红霉素
C.四环素
D.氯霉素
E.链霉素
参考答案：A
The number of people invited_______ fifty, but a number of them_______ absent for different reasons.
A．were, was
B．was, were
C．was, was
D．were, were
重楼的别名是
A．栝楼B．莎草根C．蚤休D．仙灵脾E．淡大芸
