Light levels are carefully controlled to fall within an acceptable level for ___

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问题 Light levels are carefully controlled to fall within an acceptable level for ______ reading convenience.

选项 A、intentional
B、ideal
C、obligatory
D、standard

答案 B

解析 B项ideal“理想的”，为正确答案。A项intentional“有意的”；C项obligatory“强制性的”；D项standard“标准的”。

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