西咪替丁可
A．使胃粘液分泌增加，保护溃疡面B．阻断H2受体C．阻断M受体D．直接中和胃酸E．抑制胃壁细胞质子泵
参考答案：B
We are earning more money. In fact most people are _____ than they were five years ago.[ ]
A. better off
B. well off
C. badly off
D. worse off
（）是以蒸汽为工质的旋转式机械。
A、内燃机
B、汽轮机
C、电机
D、风机
