集装箱货运出口单证中最基础的是（）。
A．提单
B．站场收据
C．装箱单
D．货箱交接单
参考答案：C
This is Ted’s photo. We miss him a lot. He ______ trying to save a child in the earthquake.
A．killed
B．is killed
C．was killed
D．was killing
已知|x|=4，|y|=5且x＞y，则2x-y的值为[ ]
A、-13
B、+13
C、-3或+13
D、+3或-13
