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,完美的”;required“必需的,要求的”;optional“随意的,可选择的”;standard“标准的,权威的”。调节灯光的照明度以方便怎么样的阅读,可以推测optimal意为“最佳的,理想的”,ideal与之意思相近,故选A。
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