练习方式：填空&句子听写
Feb 28th, 1953, in Britain, scientists James Watson and Francis Crick discover the double helix structure of DNA, the (1)___ of life. Years later, Crick describes his achievement. “Biological systems are the result of (2)___ , and may produce very complicated things, now the reason of DNA (look) looks so beautiful and simple, it goes right back to near the origins of life.”
1993, a deadly gun battle erupts shot the Branch Davidian compound in Waco, Texas, start a 51-day (3)___ between David Koresh's group and federal authorities.
(4) Sentence Dictation:__________________________________________.
句子听写提示： Wisconsin: 威斯康星
And 1983, rock group U2 releases its “WAR” album, among the (5)___ "New Year's Day" and "Sunday Bloody Sunday".
