单项选择题

The main aim of the speaker is to ______.

A．explain the derivation of the word "tip"
B．illustrate why difficult customers give bad tips
C．put forward reasons for a salary increase
D．indicate how one can get better service

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单项选择题

The Suez Canal is mentioned as an example of a ______.

A．modern canal
B．water level canal
C．lock canal
D．irrigation canal

单项选择题

What does the passage mainly discuss

A．How canals are constructed.
B．Common types of canal boats and barges.
C．The world's largest canals.
D．How canals are used and classifie