The bed should be used as a place for sleep, but more and more people like to read an iPad a lot in bed before they go to sleep.
Charles Czeisler, a professor at Harvard Medical School, and his coworkers got a small group of people for an experiment. For five days in a row, these people read either a paper book or an iPad for four hours before sleep. Their sleep patterns were monitored all night. Before and after each trial period, they took hourly blood tests to paint a day-long picture of just how much melatonin(褪黑激素) was in their blood at any time.
When the people read the iPad as compared to the paper books, they felt less sleepy at night and less active the following morning. People also took longer to fall asleep on the iPad nights, and the blood tests showed that their melatonin secretion(分泌) was delayed by an hour and a half.
The researchers concluded that because of the rise of e-readers and the widespread use of e-things among children and teenagers, more research into the "long-term influence of these e-things on health and safety is urgently needed." Czeisler and coworkers went on, in the research paper, to point out that reading an iPad in bed may increase cancer risk.
However, software has been developed that can reduce some of the blue light from the screens of phones and computers, and there are also glasses that are made to reduce short wavelengths. While they seem like a logic solution for the nighttime tech users, it needs more research.
25. In Charles Czeisler's experiment, the group of people were asked to_______.
A. sit in a row and receive the strict tests
B. read a paper book and an iPad before sleep
C. have their sleep patterns observed all night
D. have their blood tested per hour during the trial
26. The third paragraph tells us the iPad readers were likely to_______.
A. feel less sleepy and tired in the day
B. become less energetic the next morning
C. fall asleep more easily after reading
D. have a lot more melatonin secretion
27. The special software recently developed can _______.
A. reduce the harm caused by doing nighttime e-reading
B. reduce the blue light from the screens completely
C. help prevent eyes being harmed by short wavelengths
D. be used in all the e-things widely and safely
CBA