单选题
What does "smart" lighting system mean?
A、
It can be turned off when you don't speak, and be turned on when you speak.
B、
It can adjust to the internal clock of human beings.
C、
It can develop itself with time goes by.
D、
It can respond to human beings' every demand.
【正确答案】
B
【答案解析】
[分析] 第二段提到“smart”light sources 将不仅仅提供照明。第四段又提到 Meanwhile，the lighting in offices and schools could be improved to help people stay healthy and productive， by acting On their internal body clocks。故选B项。
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