一气球从离开观察员 500 f 处离地面铅直上升 , 其速度为 140m/min( 分 ) . 当气球高度为 500 m 时 , 观察员视线的仰角增加率是多少?
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【单选题】听力原文:M: I would like two tickets for the 9 o'clock show this evening. W: I'm sorry, Sir. They are sold out. But we have a few left for tomorrow. What do we learn from this conversation?
A.
The man wants to attend tomorrow's show.
B.
There aren't any tickets left for tonight's show.
C.
There aren't any tickets left for tomorrow's show.