- If the most health-conscious among us have such deep swings in our shut-eye levels throughout the year, how much sleep are the rest of us losing?
2015年12月四級(jí)真題（第三套）閱讀 Section C
- Some 40% of Americans get less than seven hours of shut-eye on weeknights.
2016年6月四級(jí)真題（第一套）聽力 Section C
- It's no surprise, then, that more than half of American adults don't get the 7 to 9 hours of shut-eye every night as recommended by sleep experts.
2015年12月六級(jí)真題（第二套）閱讀 Section A