单项选择题

Questions 24 and 25 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions. Now, listen to the news. The difference between the two versions of the timeline by NASA is

A．30 seconds.
B．5 minutes and 30 seconds.
C．7 minutes and 30 seconds.
D．3 minutes and 30 seconds.

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单项选择题

单项选择题

Questions 24 and 25 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions. Now, listen to the news. The difference between the two versions of the timeline by NASA is 您的浏览器不支持 audio 元素。