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

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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