小生，京剧中的青年男性角色。唱念以假声为主，真假声结合使用。( )P72
参考答案：对
Every possible means ________, but the teacher as well as the students ________ found a solution to the problem yet.
A．has been tried; hasn’t
B．has tried; haven’t
C．have tried; haven’t
D．have been tried; hasn’t
汉坦病毒感染后早期诊断的血清学方法是（）
A.中和抗体的检测
B.组化法检测抗原
C.特异性lgM检测
D.血凝抑制抗体的检测
E.以上都不是
