【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
【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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