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
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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
单项选择题
What is the purpose of a canal lock
A．To keep out boats that are too large for the canal.
B．To measure the tonnage of canal boats.
C．To lead and unload the cargo.
D．To change the depth of the water.
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