单项选择题

Questions 4 to 6 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.
Which is NOT mentioned in the conversation

A．The Russian space program.
B．The Chinese space program.
C．The European space program.
D．The American space program.

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单项选择题

单项选择题

Questions 4 to 6 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Which is NOT mentioned in the conversation 您的浏览器不支持 audio 元素。