单项选择题

Which of the following is the closest in meaning to "commute" in Paragraph 5, Sentence 22

A．Travel long distance regularly by train, bus and so on.
B．Speak and listen to others in communication.
C．Exchange with others for what you don't have.
D．Sleep or rest.

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单项选择题

According to the passage, which of the following is NOT true

A．The internal clock of us governs our cycles of alertness and sleep.
B．The internal clock of us can produce jet lag.
C．Long time in the biological darkness is fine to Americans.
D．During the winter in the northeast of America, a person can commute roundtrip in the dark.

单项选择题

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.