1. which sentence from the text best summarizes a main idea of the article? a) people have more ways of marking time, and they do it more precisely. b) all living things must know the time to adjusto the world as it changes. c) ancient people spent most of their time outside. d) early calendars were based on the earth's orbit around the sun.

yaantonio19    3   01.04.2021 13:53    40