现代汉语中，声调分阴平、阳平、上声、去声四类，阴平、阳平为平声，上声、去声为（）。
参考答案：仄声
All the injured in the disaster are believed ____ in time. [ ]
A. treating
B. to treat
C. to be treated
D. to be treating
Ig的独特型抗原决定簇存在（）
A.VH／CH
B.VL／CH
C.VL／CL
D.VL／CH
E.VH／VL
