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
仁爱版八上《Topic 2I must ask him to give up smoking》word学案
仁爱版七上Unit2《Topic 1 I have a small nose》word教案B
仁爱版九上《Topic 3 The world has changed for the better》word学案
仁爱版九上《Topic 1 China has developed rapidly in recent years》word教案
仁爱版八上《Topic 3 The students used live models, didn’t they》word教案
仁爱版九上《Topic 2 All these problems are very serious》word学案
2012秋仁爱版七上《Topic 1 Welcome to China》word教案
仁爱版八上《Unit 3 Our Hobbies》word学案
仁爱版九上《Topic 3 We will live in space one day》word学案
仁爱版九上《Topic 1 Pollution causes too many problems》word教案
仁爱版九上《Topic 1 Spaceships are mainly controlled by computers》word学案
仁爱版七上Unit4《Topic 3 We want to go to the zoo》word教案D
仁爱版九上《Topic 2 What has happened to the population》word教案
仁爱版七上Unit4《Topic 3 We want to go to the zoo》word教案C
仁爱版七上《Topic 2 Would you like to go for a picnic》word导学案D
仁爱版八上《Topic 1 You’d better go to see a doctor》word学案
仁爱版八上《Topic 2 I am sure there are no UFOs》word学案
仁爱版八上《Topic 2 Would you mind teaching me》word学案
仁爱版七上Unit4《Topic 2 Would you like to go for a picnic》word教案C
仁爱版八上《Unit 3 Which sport will you take part in》word学案
仁爱版七上《Topic 1 I have a small nose》word学案
仁爱版九上《Topic 2 When was it developed》word学案
仁爱版九上《Topic 2 English is spoken differently in different countries》word学案
仁爱版九上《Topic 3 Would you like to be a greener person》word学案
仁爱版七上Unit4《Topic 3 We want to go to the zoo》word教案B
仁爱版九上《Topic 3 Could you give us some advice on how to leran English well》word学案
仁爱版七上Unit2《Topic 1 I have a small nose》word教案A
仁爱版九上《Topic 3 The world has changed for the better》word教案
2012秋仁爱版七上《Topic 1 What can I do for you》word学案
2012秋仁爱版七上《Topic 1 What can I do for you》word学案1
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