旅行社机票代理应使用（）系统进行销售。
A、ICS
B、CRS
C、CCS
D、IRS
参考答案：B
She would go and inform him if she______his address.
A．know
B．had known
C．knew
D．would have known
眼眶外伤和异物定位最合适的是（）
A.CT
B.MRI
C.USG
D.X线片
E.手术
