单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. How far do the swallows migrate

A．About 200 miles.
B．About 1,000 miles.
C．About 7,000 miles.
D．About 5,000 miles.

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单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. How far do the swallows migrate 您的浏览器不支持 audio 元素。