Island(罗得岛)的首字母缩写;Providence 是罗得岛州的首府。布朗大学是美国一流大学,
创建于1764 年,是世界闻名的美国常春藤联盟(还包括哈佛大学、耶鲁大学、普林斯顿大学、布朗大学、哥伦比亚大学、宾夕法尼亚大学、达特茅斯大学和康奈尔大学)中的一员。
8. the signals that synchronize the bodys clock:平衡生物钟的光信号
练习:
1 .The clock located inside our brains is similar to our bedside alarm clock because
A it controls when we wake,when we eat and when we sleep.
B it has a cycle of 24 hours.
C it is a cycle also called circadian rhythm.
D it can alarm any time during 24 hours.
2. What is implied in the second paragraph?
A Young childrens biological clock has the same rhythm with that of the teenagers.
B People after puberty begin to go to bed earlier due to the change of the biological clock.
C Children before puberty tend to fall asleep earlier at night than adolescents.
D Teenagers go to bed later than they used to due to the light from the computer screen.
3. In the third paragraph the author wants to tell the reader that
A it is natural for teenagers to stay up late and get up late.
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