However, software has been developed that can reduce some of the blue light from the screens of phones and computers according to time of day, and there are also glasses that are made to filter (过滤) short wavelengths. While they seem like a logical solution for the nighttime tech us­ers, it needs more research.

　　本文阐述的是人们在床上使用电子产品时，对睡眠和人体健康的影响，这一研究仍需进一步的深入。

　　5．In Charles Czeisler's experiment, all the subjects were asked to________.

　　A.sit in a row and receive the strict tests

　　B.have their sleep patterns observed all night

　　C.read a paper book and an iPad at the same time

　　D.have their blood tested per hour during the trial

　　答案：B　细节理解题。根据第二段“Their sleep patterns were monitored all night.”可知答案。

　　6．The third paragraph tells us the iPad readers were likely to________.

　　A.feel less sleepy and tired in the day

　　B.fall asleep more easily after reading

　　C.become less energetic the next morning

　　D.have a lot more melatonin secretion

　　答案：C　推理判断题。根据该段第一句及最后一句“...the blood tests showed that their melatonin secretion was delayed by an hour and a half.”可推知。

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