2. 外语
  3. If you use a computer at work, you probably already know that a long day of 【B1】______ your screen can lead to eye【B2】______, ti

If you use a computer at work, you probably already know that a long day of 【B1】______ your screen can lead to eye【B2】______, ti

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问题     If you use a computer at work, you probably already know that a long day of 【B1】______ your screen can lead to eye【B2】______, tired eyes, headache, muscle aches and other symptoms of computer vision syndrome(CVS). But you may not know that CVS also can cause work mistakes and lost productivity.
    A study【B3】______ by the University of Alabama at Birmingham(UAB)School of Optometry examined the relationship between the vision of computer workers and their productivity in the workplace. This study has three findings. First, a direct correlation(关联)between proper vision correction and productivity. This relationship particularly is 【B4】______ with complex and /or repetitive computer tasks such as data 【B5】______. Second, a direct correlation between proper vision correction and the time required for a computer worker to perform a task. Computer-related tasks took much longer when the【B6】______ wore glasses with less than the best correction. Third, reduced productivity even among computer users who were【B7】______ they had vision problems. Computer users with small refractive(折射的)errors may not notice any vision 【B8】______. But without proper vision correction, their performance on a specific task can suffer significantly—by as much as 20 percent. "Our data【B9】______ suggest that improving the visual status of workers using computers【B10】______ greater productivity in the workplace, as well as improved visual comfort," said Kent Daum, OD, PhD, the study’s chief investigator.
【B7】
选项
答案unaware
解析 根据空格前的be动词were可知，此空需填入表语形容词或动词分词。unaware“没察觉到的”。
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