2017年12月英语四级阅读冲刺练习（19）
During sleep, the fatigue (疲劳 ) of the body 47 and recuperation (恢复 begins. The tired mind gathers new energy.
Once awake, the memory improves, and annoyance and problems are seen in a better 48 .
Some adults require little sleep; others need eight to ten hours in every twenty-four. __49__ sleep sixteen to eighteen hours daily and, as they grow older, the 50__ gradually diminishes. Young students may need twelve hours; university students may need ten. A worker with a 51 demanding job may also need ten, whereas an executive worker under great pressure may manage on six to eight. Many famous people are reputed to have required little sleep. Napoleon, Thomas Edison and Charles Darwin apparently 52 only four to six hours a night.
Whatever your 53 need, you can be sure that by the age of thirty you will have slept for a total of more than twelve years. By that age you will also have developed a sleep __54 a favorite hour, a favorite bed, a favorite position, and a formula
you need to follow in order to rest comfortably.
Investigators have tried to find out how long a person can go without sleep. Several people have reached more than 115 hours, nearly five days, 55 animals kept awake for from five to eight days have died of exhaustion. The __55_ for haman
beings is probably about a week.
四级冲刺：四级历年真题在线测试及下载
通关必看：考前怎么救命？资深讲师教你45小时英语四级突破426+分！立即查看>>
12月16日英语四级考后，233网校英语四级频道将及时发布真题及答案解析，请大家持续关注！
扫描下方二维码下载233网校英语四级APP，掌上刷题冲分，考后看真题对答案，查分估分！
