問題詳情

Sunlight is the main source of blue light, and 38 outdoorsduring daylight is where most of us get most of our exposure 39it. But there are also many man-made, indoor sources of bluelight, 40 fluorescent and LED lighting and flat-screentelevisions. Most notably, the display screens of computers,electronic notebooks, smartphones and other digital devices 41significant amounts of blue light. The amount of time peoplespend using these devices and the proximity of these screens tothe user's face have many health care professionals 42 possiblelong-term effects of blue light on eye health.
38.
(A) is
(B) are
(C) be
(D) being

參考答案

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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