题目内容：

To get an extra 14 years of life, don't smoke, eat lots of fruits and vegetables, exercise regularly and drink alcohol in a proper amount. That is according to a study published this Monday in the Public Library of Science Medicine Journal .

After tracking more than 20, 000 people aged 45 to 79 years in the UK from about 1993 to 2008, Kay-Tee Khaw of the University of Cambridge and his colleagues found that people who adopted these four healthy habits lived an average of 14 years longer than who didn't.

"We're known for a long time that these behaviors are good things to do, but we've not seen this benefit before," said Susan Jebb, head of Nutrition and Health at Britain's Medical Research Council. "The benefit was also seen regardless of whether or not people were fat and social class they came from. "

Study participants(参与者) scored a point each for not smoking, regular physical activity, eating five servings of fruits and vegetables a day and moderate alcohol intake.

Public health experts said they hoped the study would inspire governments to introduce policies helping people to adopt these changes. But because the study only observed people rather than testing specific changes, it would be impossible to conclude that people who suddenly adopted these healthy behaviors would surely gain 14 years.

"We can't say that any person could gain 14 years by doing these things, " said Dr Tim Armstrong, a physical activity expert at the World Health Organization. "The 14 years is an average across the population of what's theoretically(埋论上地) possible. "

"Most people know that things like a good diet matter and that smoking isn't good for them," Susan Jebb said. "We need to work on providing people with much more practical support to help them change. "

1.We can infer from the passage that _____________ .

A. people are unaware of the harm of their bad habits

B. drinking alcohol does no harm to our health and helps us live longer

C. the government should make people change their bad habits by force

D. not everyone will live 14 years longer by adopting the four healthy habits

2.Which of the following DOESN'T belong to the four healthy habits?

A. Eating five servings of fruits and vegetables a day.

B. Doing proper exercises in the morning every day.

C. Drinking alcohol in the proper amount.

D. Having a physical examination every year.

3.Which of the following can be inferred according to the passage?

A. Susan Jebb did not take part in the study.

B. The study observed people as well as tested specific changes.

C. There s no need for people under 45 to adopt these good habits.

D. Only those from first class can benefit from these healthy behaviors.

4.What should be the best title of this passage?

A. Smoking Cuts You 14 Years    B. How to Live a Healthier Life

C. Healthy Habits May Give 14 Years    D. How to Make Your Life Longer than Others