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4、在与乘客说话时，应注意语气、音量和语调。

A. 对
B. 错

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Our ultimate goal is to provide an information system, which will be very comfortable to use and very flexible.

The system should build up its reliability gradually along with the system maturity by providing truly accurate solutions and details that enhance user satisfaction.

Since anybody in the world can access the system through the internet, the security aspect will have to be strictly dealt with.

If the system is going to be a standalone one, it is doubtful whether the system will truly be able to achieve this functionality.