6 . Problems with night vision, which affect around 25 percent of people, are also on the increase because of computer use . Using computer screens means the eye must operate in electromagnetic fields (电磁场) that make it work harder. It is estimated that 25 to 30 percent of people have eye conditions, such as difficulty with night vision, which result from staring at a screen .
23. Paragraph 2 ________ 答案:B
24. Paragraph 3 ________ 答案:A
25. Paragraph 4 ________ 答案:D
26. Paragraph 5 ________ 答案:E
A. The development of poor night vision
B. The greatest threat to the eyes
C. The function of sunglasses
D. The reason for childrens nearsightedness
E. The effects of computer on the eyes
F. The ways to reduce eye complaints
27. Sunlight in the summer is believed to be one cause of ______. 答案:B
28. We can wear antr-UV glasses to protect ______ 答案:D
29. We used to believe that near- or far sightedness were inherited from ______ 答案:A
30. Over 25% of people are estimated to have difficulty with night vision due to ______ 答案:E
A. our parents
B. clouded vision
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