1 . Even light activity such as housework might help to keep the brain young, researchers say, adding to a growing body of evidence that, when it comes to exercise, every little helps.
Writing in the journal Jama Network Open, the international team of researchers report how they came to their findings by studying at least three days of activity-tracker data from 2,354 middle-aged adults from the US, together with the participants' brain scans.
From the latter, the researchers worked out individuals' brain volume, a measure linked to ageing: about 0.2% of the volume of the brain is lost every year after the age of 60. Loss or shrinkage (萎缩) of brain tissue is linked to dementia (痴呆), Spartano noted.
After taking into account factors including sex, smoking status and age, the team found that every extra hour of light physical activity per day was linked to 0.22% greater brain volume, equal to just over a year's less brain ageing. What's more, those who took at least 10,000 steps a day had a 0.35% greater brain volume than those who took, on average, fewer than 5,000 steps a day—equivalent to 1.75 years' less brain ageing.
However, the study has limitations. It used mainly white participants, and cannot prove cause and effect. The authors add that not all time spent sedentary is necessarily "bad" for the brain—particularly if people are engaged in a task that takes a lot of thinking.
Dr James Pickett, head of research at Alzheimer's Society, said, "Don't worry if you're not hill-running, but find something you enjoy and do it regularly, because we know that what's good for the heart is good for the head."
1. What can be inferred from the statistics in Paragraphs 3&4?| A．Loss of brain tissue is linked to disease. |
| B．Light physical activity raises the brain volume. |
| C．Taking 10000 steps per day is best for our brain. |
| D．Light physical activity slows down the brain ageing. |
| A．Sitting. | B．Walking. | C．Sleeping. | D．Working. |
| A．Doubtful. | B．Supportive. | C．Objective. | D．Indifferent. |
| A．Regular exercise makes you happy. |
| B．The more exercise, the better. |
| C．Doing what you like regularly is beneficial. |
| D．Light physical activities are the best. |
2 . Roller coasters are fast and exciting. But passing a painful kidney (肾) stones is not. The process is painful and can take a long time. But American researchers have found that a roller coaster ride just might help those suffering from a kidney stone. They say such rides help patients pass the stones with a 70 percent success rate.
David Wartinger led the study. He found that where the person sits on the roller coaster can make a big difference. He said, “In the pilot study, sitting in the last car of the roller coaster showed about a 64 percent passage rate. Sitting in the first few cars only had a 16 percent success rate.”
It also mattered where the stones were located in the kidney. The researchers found that stones located in the upper part of the kidney model were passed 100 percent.
When it comes to passing kidney stones, not all roller coasters are equal. The researchers used 174 kidney stones of differing shapes, sizes and weights to see if each model worked on the same ride and on two other roller coasters. They found that Big Thunder Mountain was the only one that worked. The other two roller coasters both failed the test. Wartinger said the other rides were too fast and too violent. The movement forced the stones against the side of the kidney. He said that the ideal roller coaster is rough and quick with some twists and turns.
Wartinger thinks roller coaster rides could also be used as a preventative measure. He said that a yearly ride on a roller coaster could even prevent stones from developing. “You need to heed the warnings before going on a roller coaster,” he said. “If you have a kidney stone, but are otherwise healthy and meet the requirements of the ride, patients should try it.”
He adds that it’s definitely a lower cost alternative to other treatments. And riding a roller coaster is definitely more fun!
1. According to the text, passing kidney stone is ______.| A．fast | B．exciting |
| C．interesting | D．painful |
| A．Sitting in the first car of a roller coaster. |
| B．Sitting in the middle car of a roller coaster. |
| C．Sitting in big roller coasters with doctors’ care. |
| D．Sitting in rough and fast roller coasters with twists and turns. |
| A．Worried. | B．Negative. |
| C．Supportive. | D．Skeptical. |
| A．Some treatments of kidney stones |
| B．Advantages of riding roller coasters |
| C．Roller coasters can help pass kidney stones |
| D．Kidney stones can be cured by riding roller coasters |
