GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - 81GT6X4P405DT15BJ

The passage suggests that which of the following is true of the cited "compounds and elements"? A. They were created by reactions that took place during a titanic collision. B. They were supplied by an impactor that collided with Earth. C. They were once present on the Moon but were subsequently vaporized. D. They are rarely found on planet-size bodies in our solar system. E. They are present on Earth but not on the Moon.