中国位于亚洲中的[ ]
A．东亚
B．东南亚
C．北亚
D．南亚
答案：A
With his mother him, he is getting on well with his work.
A．help
B．to help
C．helping
D．helps
长期用药不易引起"二重感染"的抗菌药物是：
A．苯唑西林B．头孢哌酮C．土霉素D．氯霉素E．米诺环素
