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
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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 lead and unload the cargo.
D．To change the depth of the water.
单项选择题
How did Maggie get to the Peak
A．By Peak Tram.
B．By cable.
C．On foot.
D．Not mentione
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