题目内容：

    For the past 100 years, people believed middle age to be around 50 years old. This is a time when we start to grow old. However, new research says we have to change this. A study from the International Institute for Applied Systems Analysis (IIAS) in Austria and Stony Brook University in New York says middle age now starts at 60 or even 65, or older. Why?

The biggest reason is that we are living longer. We are also healthier, we have better diets, we exercise more and we have more money to live in a nicer lifestyle. The IIAS said, ＂Since life expectancy has increased over the past several decades, and are continuing to increase, people once considered old should actually be viewed as more middle aged.＂

The study was not a worldwide one so perhaps not everyone in all countries can say they are middle aged when they are 65. The researchers looked at populations in 39 European countries, so this is good news for Europeans. Britain’s National Health Service warned against looking at this study and believing it to be 100 percent true. It said the researchers did not look at things which could reduce life expectancy: ＂We don’t know whether, for example, they factored (把……因素包括进去) in the possible impact of being unable to treat infections because of rising antibiotic (抗生素) resistance, or the increased numbers of people with diabetes (糖尿病) due to obesity.＂ It recommended healthy living, eating and exercise as a way to live longer.

1.What do people believe for the past century?

A.People start to grow old when they are about 50.

B.Middle age is far beyond 50 years old.

C.People will die at around 50 years old.

D.Middle age is a time when people become ill.

2.What’s the main idea of the second paragraph?

A.The main reason why we are living longer.

B.The reason why middle age now starts at 60 or even 65.

C.Life expectancy has increased.

D.Middle aged people were once considered old.

3.What do Britain’s National Health Service’s words mean?

A.It believes the study to be true.

B.To live longer, one should live a healthy life.

C.There are more people who suffer from diabetes due to obesity.

D.The researchers didn’t factor in the possible impact.

4.What is the writer’s attitude towards the study?

A.Indifferent. B.Supportive.

C.Negative. D.Objective.