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。因为optimal意为“最优化的”,故选A项。
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