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 ideal理想的；required要求的；optional选择的；standard标准。optimal意为“最优化的”，故选A项。

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