下列何药可治疗尿崩症（）
A.乙酰唑胺
B.氢氯噻嗪
C.螺内酯
D.氨苯蝶啶
E.呋塞米
参考答案：B
We stopped ______, but heard nothing. [ ]
A. to listen
B. to listen to
C. listening
D. to listening to
某工人想移动一块大石头，用了如图6所示装置，请画出图中动力F1的力臂
