試題詳解

4. According to paragraph 3, how did scientists determine that a large meteorite had impacted Earth?
(A) They discovered a large crater in the Yucatán region of Mexico.
(B) They found a unique layer of sediment worldwid
(E)
(C) They were alerted by archaeologists who had been excavating in the Yucatán region.
(D) They located a meteorite with a mass of over a trillion tons.