○C No rocks of Earth origin have been detected on Mars.
○D The velocity of rocks escaping from Earth s gravity is lower than the velocity of meteorites hitting the Earth.
○E No craters more than 60 miles across have been found on Mars.
答案:A
上文的题目大家答对了几题?大家不仅要多做题,更要善于总结,这样才会有针对性地提高。
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