According to the work of Professor James Vaupel and his co-researchers, 50% of babies born in the US in 2007 have a life expectancy of 104 or more.

2019年6月四级真题（第一套）阅读 Section B

In response to past critics, Twenge and her co-researchers stress they are not trying to prove that the use of digital devices reduces young people's well-being.

2019年12月六级真题（第一套）阅读 Section B