2+3____6
5×2____7
14____7+7
明清时期,江南地区出现了许多实用性读物,如《陶朱公致富奇书》《四民必用》(沈氏农书》《耕心农话》《杵臼经》《布经》等。这是因为( )
人类的生存____于环境。
-- What's wrong, Daming?
-- Oh, I feel sad to hear more than _______ people lost their lives in the earthquake in Sichuan at 2:28 on the afternoon of May 12, 2008.