Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.
2.【2024年全国甲卷语法填空】Yellowstone was the _________ (large) United States national park-2.2 million acres-until Wrangell-Saint Elias in southern Alaska, which became a national monument in 1978, took the ...