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II. Grammar and Vocabulary
Section A
Directions: After reading the passage below, fill in the blanks to make the passages coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank.
Blue light from smart phones could accelerate blindness
Blue light from digital devices like smart phones could accelerate blindness, researchers found.
According to a research (21) __________ the University of Toledo in the US, exposure to blue light continuously (22) __________ cause poisonous molecules to be generated in the eye's light-sensitive cells and lead to macular degeneration.(黄斑变性)
As one of the (23) __________ (lead) causes of blindness in the US, macular degeneration does not lead to total blindness, but can make daily activities difficult.
It's no secret (24) __________ blue light harms our vision by damaging the eye's retina. Our experiments explain (25) __________ this happens, and we hope this leads to therapies that slow macular degeneration, such as a new kind of eye drop, said Dr Ajith Karunarathne, an assistant professor in the university's department of chemistry and biochemistry.
Macular degeneration is caused by the death of photo-receptors, a kind of light-sensitive cells. Photoreceptor cells need molecules called retinal (26) __________ (sense) light and trigger sign-alling to the brain, enabling us to see.
If you shine blue light on retinal, the retinal kills photo-receptor cells as the signalling molecule on the membrane dissolves, said Kasun Ratnayake, a PhD student at the University of Toledo (27) __________ (involve) in the study.
Photo-receptor cells do not regenerate in the eye. (28) __________ they're dead, they're dead for good, Ratnayake added.
To protect eyes from blue light, researchers advise people to wear sunglasses (29) __________ filter both UV and blue light outside and avoid (30) __________ (use) smart phones or tablets in the dark.

【嘉定】2020学年高一下阶段测试题(含答案)

2021-09-07 17:47
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