吉林省四平市2014
高考英语阅读理解巩固全程训练(12)及答案《广东省2012届高三考前冲刺卷(六)》c by analyzing the dna of the world’s oldest people,boston university scientists said they have discovered a genetic signature(特征)of longevity.they expect soon to offer a test that could let people learn whether they can live to a very old age. the researchers said they