引起上消化道出血最常见的原因是()。
A.胃癌
B.胃动脉瘤
C.应激性溃疡
D.胃息肉
E.胃十二指肠溃疡
参考答案:E
—How does your father go to work?
—He often goes to work __________.
A.by a bus
B.take the bus
C.by bus
D.take bus
现在新式的油轮都有专设的洗舱泵。