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【单选题】

Proper lighting is a necessary for good eyesight even though human night vision can be temporarily impaired by extreme flashes of light.
A．needful

B．necessity
C．exigency
D．need
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根据网考网移动考试中心的统计，该试题：

2%的考友选择了A选项

74%的考友选择了B选项

6%的考友选择了C选项

18%的考友选择了D选项

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