[单项选择]Passage One A. Differences between the planets in the solar system. B. The composition of Earth and the moon. C. Why Earth has an iron core. D. The origin of the moon,
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[单项选择]Passage One A. Earth’s moon used to orbit Mars. B. Mars was captured by the gravitational field of the Sun. C. A planet with the size of Mars collided with Earth. D. The size of Mars is larger than that of Earth.