Ruhli notes researchers used that technique to study the evolution of the tuberculosis bacteria from 2,000-year-old mummified tissue to modern-day strains.

VOA: standard.2010.05.05

so you can, like, study all your class notes and your readings and then take the practice exams,

所以你可以，好好看一下笔记和阅读材料，接着参加模拟考试，

考试应该这么准备 - SpeakingMax英语口语达人

Fisher notes that not every stutterer in the Drayna study had the defective gene, meaning there must be a number of other genes tied to stuttering.

VOA: standard.2010.02.11