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RC - Passage mainly discusses

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mozarik Newbie | Next Rank: 10 Posts Default Avatar
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RC - Passage mainly discusses

Post Thu Dec 07, 2017 7:03 am
first of all im sry if im in the wrong forum, but this forum is the best i can find. im here to understanding.
sd
so i got this passage

Smartphones, tablets and e-readers should have an automatic "bedtime mode" that stops them disrupting people's sleep, says a leading doctor.
Prof Paul Gringras argued the setting should filter out the blue light that delays the body clock and keeps people awake later into the evening.
The doctor, from Evelina Children's Hospital in London, said every new model was "bluer and brighter".
He said manufacturers needed to show more "responsibility".
As it gets darker in the evening, the body starts to produce the sleep hormone melatonin - which helps people nod off.
Certain wavelengths of light, those at the blue-green end of the spectrum, can disrupt the system.
Prof Gringras was part of a study, published in Frontiers in Public Health, analysing the light emitted by devices.
It concluded there was a clear trend for new devices to be bigger, brighter, have higher levels of contrast and emit more blue light.
The professor of children's sleep medicine told the BBC News website: "That is great for use in the day, but awful for use at night.
"There is converging data to say if you are in front of one of these devices at night-time it could prevent you falling asleep by an extra hour."
He said some sleep-aware apps had already been designed to reduce blue-green light emissions.
And that a bedtime mode could automatically filter out the blue as software such as f.lux already does.
He said there needed to be "more responsibility from manufacturers" and the "key is to automate it".
Prof Gringras added: "It's not good enough to say do less and accept this is the world we live in, they're fun devices but we do need some protection on what they do at night-time."

or you can follow this link "http://www.bbc.com/news/health-34744859"

1. The passage mainly discusses a topic on ...

A.sleep disorder and its cure
B.problem with new electronic gadgets
C.electronic gadgets that help people fall asleep
D.blue-green light found in electronic devices
E.new technology that can help reduce sleep disruption

for this question i tried answer option B

but my friends said. its D , he says it because mostly it about blue-green light. but it think is not because in the passage its not about "blue-green light found in electronic devices" key words : found. because it just already in there and it just a new devices got bluer and brighter
but my teacher said , its E. because nothing of any option is correct. but i think its too spesific .

sry for my grammar .

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