Rollercoastersarefastandexciting.Butpassingapainfulkidn...

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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!

12. According to the text, passing kidney stone is ______.

A. fast B. exciting

C. interesting D. painful

13. Which of the following benefits people with a kidney stone most?

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.

14. What’s Wartinger’s attitude to riding roller coasters for people having a kidney stone?

A. Worried. B. Negative.

C. Supportive. D. Skeptical.