Lighting levels are carefully controlled to fall within an acceptable level for optimal reading convenience.

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问题 Lighting levels are carefully controlled to fall within an acceptable level for optimal reading convenience.

选项 A、ideal
B、required
C、optional
D、standard

答案A

解析 句中词“optimal”表示“最佳的,最理想的”。A项表示“理想的,完美的”;B项表示“必须的”;C项表示“可选择的,随意的”;D项表示“标准的,权威”。A项的词义与原文相符,所以应该选A。
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