BT延长，PLT减低，首先考虑的疾病是（）
A.原发性血小板减少性紫癜
B.过敏性紫癜
C.单纯性紫癜
D.血管性紫癜
E.血小板增多症
参考答案：A
_____ boys and girls in that school are almost equal, of which both of the headmasters are proud. [ ]
A. A number of
B. The numbers of
C. Numbers of
D. The number of
163，1189，1315，1441，( )
A．1567
B．1620
C．1756
D．1897
