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[VOA慢速] VOA慢速精精听2019-01-29

提高英语听力能力 找对方法很重要!
Homework
Only 8 out of the 18 total students in that first group agreed to take part in an experiment. Yet all the students who took part , performed better on the exam than those who did not, even before they extra credit points were added. On average they earned about 5 points more on the exam. Skolen then decided to repeat the study with another group of 16 design students. He chose not to punish students who failed to sleep the 48 hours polite and got the same results. Dannel Basison is a medical doctor who researches sleep and was not involved in the study. He is also the associate director of the Anshent health and Willing center at the University of Corlodoa out of Denver.
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