The best anti-ageing technique could be standing up, scientists believe spending more time on two feet protects DNA. A study found that too much sitting down shortens telomeres（染色体终端）——the protective caps which sit at the end of chromosomes（染色体）.

Short telomeres can make people premature（过早的）ageing, ill and early death. So spending less time on the sofa could help people live longer by preventing their DNA from ageing.

The research found that people who often stood on their feet had longer telomeres. And it also finds that taking part in more exercise did not seem to have an impact on telomere length. The less time one person sits, the longer he will live. 

In many countries formal exercise may be increasing, but at the same time people spend more time sitting. The biggest problem for people’s health is not to exercise less, but sitting for a long time. We think that a reduction（减少）in sitting hours is more important than an increase in exercise time to those premature ageing people. Researchers looked at 49 overweight adults in their late sixties and measured the length of the telomeres in their blood cells. Half of them took part in the exercise progra that lasted six months, while the other half did not. They used a pedometer to measure the amount of footsteps they walked each day. The amount of time spent sitting down was worked out through a questionnaire（调查问卷）.

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1.The best technique to stop people from becoming old is ______.

A to have short telomeres

B to stand up

C to sit down

D to work less

解析：选B。B 细节理解题。由第一段的“The best anti-ageing technique could be standing up”可知最好的抗衰老技术可能就是站起来。故选B。

2.From the passage we know that ______ could help people live longer.

A spending less time on the sofa

B sleeping on the sofa

C playing on the sofa

D working on the sofa

解析：选A。A 细节理解题。由第二段的“So spending less time on the sofa could help people live longer by preventing their DNA from ageing.”可知减少坐在沙发上的时间，能使人长寿。故选A。

3.The biggest problem for people’s health is _______.

A eating too much

B to exercise less

C sitting for a long time

D overweight

解析：选C。C细节理解题。由第四段的“The biggest problem for people’s health is not to exercise less, but sitting for a long time.”可知应选C。

4.In the research, about ______ persons took part in the exercise program.

A 49

B 6

C 94

D 24

解析：选D。D 推理计算题。由第四段的“Researchers looked at 49 overweight adults in their late sixties and measured the length of the telomeres in their blood cells. Half of them took part in the exercise program that lasted six months,”可计算出大约有24个人，故选D。

5.According to the passage, which of the following is NOT TRUE?

A If we want to live longer, we should sit down less time.

B Telomeres are the protective caps of the end of chromosomes.

C Taking part in more exercise has an impact on telomere length.

D A reduction in sitting hours is more important to our health.

解析：选C。C 综合性判断题。依据文中“The less time one person sits, the longer he will live.”可判断A与原文相符；依据文中“A study found that too much sitting down shortens telomeres——the protective caps which sit at the end of chromosomes.”可知端粒就是染色体末端的保护帽，可判断B与原文相符；依据文中“And it also finds that taking part in more exercise did not seem to have an impact on telomere length.”可知端粒的长短与锻炼的多少无关，故可判断C与原文不符。