专四专八考试

【单选题】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 lockA．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.

网考网参考答案：D
网考网解析：
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