【22·DY·英语-WYB-英语5-QG】全国100所名校单元测试示范卷·英语卷一 第一套Module 1 British and American English

【22·DY·英语-WYB-英语5-QG】全国100所名校单元测试示范卷·英语卷一 第一套Module 1 British and American English，查看2022届全国100所名校单元测试示范卷的答案，请关注微信公众号：考不凡

【22·DY·英语-WYB-英语5-QG】全国100所名校单元测试示范卷·英语卷一 第一套Module 1 British and American Englishand field event at the Summer Olympics is the 50-kilometer race walk，which is about five miles longer than the mara-
thon.But the sport's rules require that a race walker's knees stay straight through most of the leg swing and one foot re-
main in contact（接触）with the ground at all times.It's this strange form that makes race walking such an attractive ac-
tivity，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 ata 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.