2014
高考英语阅读理解基础训练题（106）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 had
