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Directions： Listen to the following passage about time travel． Altogether the passage will be read to you four times． During the first reading， which will be done at normal speed， listen and try to understand the meaning． For the second and third readings， the passage will be read sentence by sentence， or phrase by phrase， with intervals of 15 seconds． The last reading will be done at normal speed again and during this time you should check your work．
_____________________________________．
1． What will it be like if time travel into the future is possible？
2． Do you believe time travel is possible？ Why or why not？
Prior to the era of modern sleep research in the early 1920s， scientists regarded sleep as an inactive brain state． It was generally accepted that as night fell and sensory inputs from the environment diminished， so too did brain function． In essence， scientists thought that the brain simply shut down during sleep， only to restart again when morning came．
In 1929， an invention that enabled scientists to record brain activity challenged this way of thinking． From recordings known as electroencep halograms （ EEGs ），researchers could see that sleep was a dynamic behavior in which the brain was highly active at times， and not turned off at all． Over time， sleep studies using EEGs and other instruments have revealed two main types of sleep defined by electrical patterns in the brain and the presence or absence of eye movements．
Directions： Please watch a video about coffee and wine's effects on sleep and summarize the main idea of the video in one sentence ．
_____________________________________．
Directions： Read the following statements about the video． Decide true （ T） or false （F） for each statement．
（1）A glass of wine before bedtime improves your sleep．
［T］ ［F］
（2）Holly stayed awake the whole night as a result of coffee drinking．
［T］ ［F］
（3）In a night's sleep we usually go through five stages．
［T］ ［F］
（4）Deep sleep is marked by rapid eye movement．
［T］ ［F］
（5）Disturbing the sleep cycles can reduce one's ability to focus．
［T］ ［F］
（6）It is suggested to ensure an average eight hour's sleep a day．
［T］ ［F］
Directions： Watch the video again． While watching， you are required to take notes on details and get ready to summarize the video orally or in written form． The following table will help you organize the information concerning coffee and wine's effects on sleep．
