亚洲第一极品精品无码久久_无码国产色欲xxxx视频_国精品无码一区二区三区在线蜜臀_日韩av无码精品一二三区

2020年高考英語全國卷Ⅰ閱讀理解C閱讀材料出處

柯帕斯英語網(wǎng)有一組關(guān)于最新高考英語真題的閱讀材料的出處文章，對參加高考的學(xué)生和教師都很有借鑒意義。現(xiàn)將這些挖掘高考英語真題閱讀材料出處的有關(guān)文章在站分期轉(zhuǎn)載。

2020年-高考英語-全國1卷-閱讀理解C-材料出處

【高考真題】

Race walking shares many fitness benefits with running, research shows, while most likely contributing to fewer injuries. It does, however, have its own problem.

Race walkers are conditioned athletes. The longest track and field event at the Summer Olympics is the 50-kilometer race walk, which is about five miles longer than the marathon. But the sport’s rules require that a race walker’s knees stay straight through most of the leg swing and one foot remain in contact (接觸) with the ground at all times. It’s this strange form that makes race walking such an attractive activity, however, says Jaclyn Norberg, an assistant professor of exercise science at Salem State University in Salem, Mass.

Like running, race walking is physically demanding, she says. According to most calculations, race walkers moving at a pace of six miles per hour would burn about 800 calories (卡路里) per hour, which is approximately twice as many as they would burn walking, although fewer than running, which would probably burn about 1,000 or more calories per hour.

However, race walking does not pound the body as much as running does, Dr. Norberg says. According to her research, runners hit the ground with as much as four times their body weight per step, while race walkers, who do not leave the ground, create only about 1. 4 times their body weight with each step.

As a result, she says, some of the injuries associated with running, such as runner’s knee, are uncommon among race walkers. But the sport’s strange form does place considerable stress on the ankles and hips, so people with a history of such injuries might want to be cautious in adopting the sport. In fact, anyone wishing to try race walking should probably first consult a coach or experienced racer to learn proper technique, she says. It takes some practice.

【真題出處】

https://www.cpsenglish.com/question/47866

【更多出處】