Question

A new international study shows that some people's biological clock plays a powerful role for their life expectancy, regardless of lifestyle choices.

Published in the latest issue of Aging on Wednesday, the study has found the most definitive evidence to explain why some people keep healthy lifestyle but die younger than others.

Geneticist Steve Horvath from the University of California, Los Angeles (UCLA), led a team of 65 scientists around the world to record age-related changes to human DNA, analyse blood samples collected from 13, 000 people and estimate their lifespan.

A higher biological age, regardless of actual age, consistently predicts an earlier death, the study says.

"You get people who are vegan, sleep 10 hours a day, have a low-stress job, and still end up dying young," Horvath said in a statement. "We have shown some people have a faster innate aging rate."

The findings discovered that 5 percent of the population ages at a faster biological rate, which translated to a roughly 50 percent higher than average risk of death at any age.

"The great hope is that we find anti-aging interventions that would slow your innate aging rate," Horvath said, adding that "this is an important milestone to realizing this dream."

1.Some people keep healthy lifestyle but die younger than others because ________.

A. their biological clock is not powerful enough

B. the most definitive evidence has been found

C. they have a higher actual age than others

D. they ages at a relatively faster biological rate

2.How was the study conducted?

A. By collecting and analyzing data.

B. By interviewing lots of people.

C. By researching previous studies.

D. By studying different lifestyles.

3.According to the study, it can be inferred that ________.

A. people who keep healthy lifestyle tend to live longer

B. people’s lifespan can be predicted by their age

C. 5 percent of people are believed to have a faster innate aging rate

D. anti-aging interventions have proved to slow the innate aging rate

4.Which of the following would be the best title for the passage?

A. We all should keep healthy lifestyle

B. Geneticist finds anti-aging interventions

C. Biological clock predicts life expectancy

D. Horvath builds an important milestone

Answer

1.D

2.A

3.C

4.C

【解析】

试题分析：本文讲述了一项最新研究成果：生物年龄才是制约一个人寿命的重要因素，而不是我们的实际年龄。有约5%的人口是以较快的生物速度老化的，这解释了为什么有的人生活方式健康仍然早逝。

1. 细节理解题。根据倒数第三段"You get people who are vegan, sleep 10 hours a day, have a low-stress job, and still end up dying young," Horvath said in a statement. "We have shown some people have a faster innate aging rate."可知，一些人生活健康但仍然比其他人早死是因为他们以一个相对较高的生物速度老化，故选D项。

2. 细节理解题。根据第三段to record age-related changes to human DNA, analyse blood samples（收集与年龄相关的人类DNA变化并对血样进行分析）可知，科学家是通过收集和分析数据得到的结论，故选A项。

3. 推理判断题。根据倒数第二段5 percent of the population ages at a faster biological rate (大约有百分之五人口的生物是以较快的生物速度老化的)，故C项与原文的表述一致。

4. 主旨大意题。本文的第一段就阐述了本文的大意，biological clock plays a powerful role for their life expectancy（生物钟对人们的寿命预期起到了重要的作用），故C项适合作文章题目。