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.
What can be inferred about the swallows mentioned in the conversation

A．They are a type of insects.
B．They are a kind of fish.
C．They are a type of bird.
D．They are a type of pig.

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单项选择题

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. What can be inferred about the swallows mentioned in the conversation 您的浏览器不支持 audio 元素。