How long will you live? Probably much longer than you think, the Washington Post reports. 

In 1992, the University of Michigan's Health and Retirement Study asked 26,000 Americans over the age of 50 what they thought the chances were they'd live to the age of 75. Now, nearly 24 years later, researchers at the Brookings Institution have calculated to see if they were right.

"In general, people wildly underestimated their chances of reaching 75," Christopher Ingraham writes on the Post's Wonk Blog.

• In 1992, 7 percent of respondents gave themselves "zero" chance to reach 75. But nearly half  lived to 75 or longer.

• Among respondents who gave themselves a 50 percent chance of living to 75, 75 percent lived to that age or longer.

• And among those who said they were "100 percent" certain of living to the age of 75, nearly 8 in 10 did.

You'll probably live much longer than you think you will. Life expectancy in the United States was 78.74 years in 2012, according to World Bank data, and 71 years worldwide.

There is no clear relationship between how long people think they'll live, and how long they actually do, Ingraham notes.

In fact, respondents who gave themselves at least a 10 percent chance of living to 75 had at least a 60 percent chance of doing so.

Your best bet that you'll live to 75? Thinking you have a 90 percent chance, the study concluded.

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1.When did the survey take place?

A In 1992

B In 2004

C In 2014

D In 1998

解析：选A。A 细节理解题。根据第2段“In 1992, the University of Michigan's Health and Retirement Study asked 26,000 Americans over the age of 50”1992年密歇根大学的健康和退休研究问了超过50岁的26000名美国人可知。

2.What does the underlined word underestimate mean in Chinese?

A 理解

B 估计

C 低估

D 期待

解析：选C。C 推理判断题。根据第4段 “In 1992, 7 percent of respondents gave themselves "zero" chance to reach 75. But nearly half lived to 75 or longer.可知，低估了他们的到达75岁的机会。

3.Which of the following is not true according to the passage?

A 26,000 Americans over the age of 50 were accepted the survey.

B Those people who said "100 percent" certain of living to the age of 75, nearly 8 in 10 did.

C There is no clear relationship between how long people think they'll live, and how long they actually do.

D Those people who gave themselves "zero" chance to reach 75 died when they were under 74.

解析：选D。D 推理判断题。根据第4段“But nearly half lived to 75 or longer.”一半的人活到75岁或更长，可知。

4.From the passage we can know in 2012 people can reach ______all over the world.

A 75

B 71

C 78

D 68

解析：选B。B 细节理解题。根据第7段“and 71 years worldwide.”可知，全世界平均岁数为71，所以选B。

5.What’s the best title of the passage?

A Life and health

B Study and life

C How long will you live?

D Exercise and health

解析：选C。C 主旨大意题。从第一段“How long will you live? Probably much longer than you think”可知,你能活多长，或许比你想的更长。