危象是MG死亡的常见原因，肺部感染或手术（如胸腺切除术）可诱发危象，情绪波动和系统性疾病可加重症状。
参考答案：对
Can you tell me who is _____ this company now?
[ ]
A. in the charge of
B. in charge of
C. charge of
D. charge to
梅毒患者宜选用：
A．氨苄西林B．头孢氨苄C．磺胺嘧啶D．青霉素GE．羧苄西林
