TOEFL Reading: ETS-TOEFL阅读机经 - 1DEN3V1S037183YIL$

Which of the following can be inferred from paragraph 3 about meteorites? A. Their composition can help determine the part of the larger body from which they broke off. B. They are difficult to distinguish from rocks in Earth's mantle. C. Their collisions with Earth have become more frequent than in the past. D. They are older than the rest of the solar system.