Do you ever worry about your chances of surviving a doomsday which is due to an impact of an asteroid(小行星) or a comet? Do you know that our water, gold, and platinum most likely come from the asteroids and comets that hit the Earth long ago? Currently, about a hundred tons of sp...
B. An asteroid impact caused many species to di e ou t. C. T h e Sudbury crater becam e th e sit e of profitable mnes. D. T h e South Pole-Aitken basin cam e into being on th e Earth.4. What does th e passag e mainly talk about? A. Asteroids and comets in our Solar ...