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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

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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 load and unload the cargo.
D．To change the depth of the water.

单项选择题Why did the woman go to Hong Kong

A．On business.
B．On holiday.
C．Visiting friends.
D．Taking pictures.