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练习方式：填空

Feb 17th, 1992, in Milwaukee, serial killer Jeffrey Dahmer gets life in prison for his (1)___ string of murders. Just a few years later, Dahmer is killed behind bars by a fellow inmate.

1972, President Richard Nixon leaves on his historic trip to China, a (2)___ breakthrough that ends years of silence between Washington and Beijing.

1996, World chess champ Garry Kasparov beats "Deep Blue" - an IBM (3)___ in a six-game match in Philadelphia. " A retreatment to preserve ? ?, and I knew that I could learned much better, becuase my appoint would need more time to learn and combat with a really, a sophisticated conquer strategy."

(4) Sentence Dictation:________________________________________________.