单项选择题

In the following places, where can we not find the LEDs

A．Digital clock.
B．Traffic lights.
C．Swimming pools.
D．Cassette players' speakers.
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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 the author mean by Family is of course an elastic word
A．Different families have different ways of life.
B．Different definitions could be given to the word.
C．Different nations have different ways of life.
D．Different times produce different families.
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