单项选择题


A．advantages
B．disadvantages
C．point
D．cases
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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 watch
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 classified.
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