如图所示，请画出铡刀铡东西时动力F1的力臂l1．
延长动力作用线，由支点作动力作用线的垂线，L1是动力臂．如图所示：
-Beijing _____the 2008 Olympic Games. And China won many gold medals.
-Yes, we are really excited at that great news for a long time.[ ]
A. had
B. held
C. won
D. hosted
两肺满布湿啰音最多见于下列哪一种疾病（）
A.急性肺水肿
B.重症肺结核
C.支气管扩张症
D.支气管肺炎
E.弥漫性肺间质纤维化
