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.
Each of those machines can only perform ______.

A．many operations
B．two operations
C．a single operation
D．none of operations

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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. Each of those machines can only perform ______. 您的浏览器不支持 audio 元素。