在我国出口贸易业务中，出口合同履行最为重要的环节为( )。
A．证
B．货
C．保
D．船
E．款
参考答案：A,B,D,E
What the remote areas need ________ education to children and what the children need
________ good textbooks and teachers at the moment.[ ]
A. is; are
B. are; is
C. was; were
D. were; was
脑疝形成的机制（）
A．颅腔内容物体积增大
B．颅内血容量增加
C．颅内脑脊液增加
D．颅内压力分布不均
E．颅内占位性病变
