But if people charge their phones when they are asleep, the phones release short-wavelength(短波长) blue light. Although it is not bright enough to light up a room, it can affect our sleep. Therefore, it slows down our metabolish and affects our body to digest food. This may cause obesity(肥胖).

“Blue light is bad for our health because it keeps the mind buzzing(嗡嗡声), Simon Kyle, a sleep scientist at Manchester University, told the Daily Mail.

And there is strong scientist data to show the connection between interference and people’s health.

Earlier this year, leading scientists from universities including Oxford, Cambridge and Harvard, warned that a lack of sleep could cause serious health problems, such as cancer, heart disease and obesity.

Kyle advised turning off smart phones and desktop computers a few hours before going to bed. This helps to reduce people’s exposure to artificial(人工的) light.

41.The author writes the text to _______.

A.enrich reader’s life through smart phones and computers B.warn readers to stay away from phones when sleeping C.help readers know more about hearing problems D.teach readers how to eat less food before going to bed 42.The underlined word “it in paragraph 2 refers to a_______ .

A.blue light B.the body C.metabolish D.melatonin 43.From Paragraph 3, we learn the blue light from the phones can_______.

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