We all know that the normal human daily cycle of some 7-8 hours sleep alternating with some 16-17 hours wakefulness and that, broadly speaking, the sleep normally coincides with the hours of darkness. Our present concern is win how easily and to what extent this cycle can be modified. One answer would seem to be longer periods on each shift, a month, or even three months. Recent research by Bonjer of the Netherlands, however, has shows that people on such systems will revert to their normal habits of sleep and wakefulness during the week-end and that this is quite enough to destroy any adaptation to night work built up during the week. 1. The question raised in Paragraph 1 is no mere academic one B)because sleep normally coincides with the hours of darkness. D)because shift work in industry requires people to change the sleeping habits. A) people hate the inconvenience of working on night shifts. C) not all industries work at the same hours. 3. According to the passage, the best solution on the problem seems to be B) to make periods on each shift longer. D) to find ways of selecting people who adapt quickly. A) the third week C) a third of the time 5. In the last sentence of the second paragraph, another means B) another shift D) another person
2016春牛津译林版英语五下Unit 3《Asking the way》(Story time)ppt课件1
2016春牛津译林版英语五下Unit 3《Asking the way》ppt课件4
2016秋苏教译林版英语五年级上册Unit 7《At weekends》ppt课件6
2016秋苏教译林版英语五年级上册Unit 7《At weekends》ppt课件4
2016秋苏教译林版英语五年级上册Unit 8《At Christmas》ppt课件6
2016秋苏教译林版英语五年级上册Unit 7《At weekends》ppt课件9
2016秋苏教译林版英语五年级上册Unit 8《At Christmas》ppt课件7
2016春牛津译林版英语五下Unit 3《Asking the way》ppt课件3
2016春牛津译林版英语五下Unit 3《Asking the way》(period 1)ppt课件包
2016春牛津译林版英语五下Unit 3《Asking the way》(period 4)ppt课件包
2016春牛津译林版英语五下Unit 2《How do you come to school》(第1课时)ppt课件
2016秋苏教译林版英语五年级上册Unit 7《At weekends》ppt课件5
2016春牛津译林版英语五下Unit 4《Seeing the doctor》(第1课时)ppt课件
2016秋苏教译林版英语五年级上册Unit 8《At Christmas》ppt课件3
2016春牛津译林版英语五下Unit 3《Asking the way》mp3课文朗读
2016春牛津译林版英语五下Unit 3《Asking the way》(period 3)ppt课件包
2016春牛津译林版英语五下Unit 6《In the Kitchen》(第1课时)ppt课件
2016秋苏教译林版英语五年级上册Unit 6《My e-friend》ppt课件4
2016秋苏教译林版英语五年级上册Unit 7《At weekends》ppt课件1
2016春译林版英语五下Unit 1《Cinderella》ppt课件1
2016春牛津译林版英语五下Unit 4《Seeing the doctor》(第1课时)ppt课件1
2016秋苏教译林版英语五年级上册Unit 8《At Christmas》ppt课件5
2016春牛津译林版英语五下Unit 3《Asking the way》(Story time)ppt课件
2016秋苏教译林版英语五年级上册Unit 7《At weekends》ppt课件2
2016春牛津译林版英语五下Unit 8《Birthdays》ppt课件2
2016春牛津译林版英语五下Unit 3《Asking the way》ppt课件1
2016春牛津译林版英语五下Unit 3《Asking the way》ppt课件
2016秋苏教译林版英语五年级上册Unit 8《At Christmas》ppt课件1
2016秋苏教译林版英语五年级上册Unit 6《My e-friend》ppt课件6
2016春牛津译林版英语五下Unit 7《Chinese festivals》mp3课文朗读
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