What is the purpose of a canal lockA．To keep out b

单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now listen to the passage.

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.

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