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This is Whats Trending Today... The United States named 12 new astronauts this week. The astronauts will work for NASA, the American space agency. The astronaut class of 2017 includes doctors, scientists, engineers, pilots and military officers. Seve
发表于:2019-01-02 / 阅读(403) / 评论(0)
2017年VOA慢速英语(六)月