我国现行的海洋货物运输保险由（）构成。
A、基本险
B、水渍险
C、附加险
D、专门险
E、一切险
参考答案：A, C, D
One of our rules is that every teacher wear school uniform while attending the school flag-rising ceremony.
A． might
B． shall
C． could
D． will
最常见的缺铁性贫血的病因是
A．感染B．酗酒C．铅中毒D．慢性失血E．长期输血
