最近西安市进行了一项奥数体验测试,邀请来自各个大学的老师参加,其中只有一人考试及格,此次测验的平均分是28分,请问你怎么看?
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Chang’e-2 is expected to provide high-resolution images of chang’e-3 ‘s landing area.
______will be launched between 2010 to make preparations for the construction of China’s first space station, which it aims to be in operation by the year______.
Why will NASA and the European Space Agency combine their efforts to explore Mars in the future?
How many robots launched by NASA are mentioned in the passage?