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

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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 classified.

单项选择题

In the third sentence of paragraph, the troubled issue refers to______.

A．the death of the old king
B．Merlin' s advice
C．the succession to the crown
D．the quarrel among the powerful lords