南京市2015
高考英语阅读理解一轮训练（15）及答案 《广东省2012届高三考前冲刺卷(六)》 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
