题目内容：

    Getting old might not be something that's yet to cross your mind. But ageing is unavoidably going to get the better of us one day. And that’s why scientists are constantly seeking out evidence that will show us what we need to do to achieve longevity.

We all know that regular exercise is good for us. In recent years, although we've been told to aim to walk 10,000 steps a day to remain healthy, other advice to do three quick and energetic 10-minute walks a day is thought to be even more effective. And the latest piece of research might put a spring in your step if you’re someone who walks at a fast pace. That’s because, according to scientists, the speed at which people walk in their 40s is a sign of how much their brains, as well as their bodies, are ageing.

Tests on 1,000 people from New Zealand born in the 1970s found that slower walkers tended to show signs of "accelerated ageing". Their lungs, teeth and immune systems were in worse shape than those who walked fester. And what’s worse, the study found not only did slower walkers' bodies age more quickly, their faces looked older and they had smaller brains.

This might be seen as a wake-up call for people with a slower pace who might feel it's time to work out get fitter. But it might be too late; researchers say they were able to predict the walking speed of 45-year-olds using the results of intelligence, language and motor skills tests from when they were aged three. They also suggest that even in early life, there are signs showing which people will go on to have a healthier life.

So, what's the point of knowing that a slower walking pace might mean a smaller brain? Well, researchers say measuring walking speed at a younger age, and understanding what this might mean, could be a way of testing treatments to slow human ageing. This might help us make lifestyle changes while we're still young and healthy. Any steps we can take to prolong a good mental and physical state is a no brainer!

1.Which of the following is considered to be a better choice?

A.Walking 10,000 steps a day. B.Doing three quick and energetic walks a day.

C.Doing irregular exercise every day. D.Frequently doing sports in spring.

2.What can be inferred from the passage?

A.Faster walkers will get fitter, be younger and have bigger brains.

B.People's health condition can be predicted from their walking speed at 45.

C.This study found that slower walkers age more slowly.

D.People who walk faster are more brilliant than slower walkers.

3.What does the underlined word "prolong" in Para.5 mean?

A.give something up B.transfer something at random

C.make something last longer D.put something off

4.What would be the best title?

A.Walking to Stay Young B.Getting Old and Doing Exercise

C.Having a Happy Life D.Slow Walking and Ageing