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

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

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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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