300户业主的年收入分组资料如下表:则业主的年收入众数为()。
A.5000~6000
B.6000~7000
C.7000~8000
D.8000~9000
参考答案:C
When the reached the top of the hill, they _____ so they had to stop for a rest. [ ]
A. held their breath
B. out of breath
C. lost their breath
D. breathed deeply
法鲁氏四联症不包括下列哪种异常改变()
A.肺动脉狭窄
B.室间隔缺损
C.升主动脉骑跨
D.右室肥大
E.主动脉瓣与二间瓣之间正常纤维连续消失