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【多选题】
When we can’t sell a passenger a round-trip ticket, what should we do as the station officers?
A.
The station officer should explain the reason why there’s no round-trip ticket patiently.
B.
The station officer could advise the passenger to buy one-way ticket and get another one-way ticket on the way back.
C.
The station officer could advise the passenger to buy a prepaid transportation card.
D.
The station officer could advise the passenger to download a payment app and pay for the journey conveniently.
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参考解析：
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【单选题】函数 是函数 的导函数，且函数 在点 处的切线为 ，如果函数 在区间 上的图像如图所示，且 ，那么 （ ）
A.
是 的极大值
B.
= 是 的极小值点
C.
不是 极值点
D.
是 极值点