单项选择题

A．It’’s amazing that anyone could move so fast.
B．Televisions mark the beginning of modem life.
C．Modem life is changing very fast.
D．It’’s hard to remember the past.
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单项选择题
What effect does excessive positive ionization have on some people
A．They think they are mad.
B．They feel very tired.
C．They become violently sick.
D．They are too tired to do anything.
单项选择题
Which of the following statements is NOT true according to the passage
A．Getting too little sleep is the commonest sleep trouble with most Americans who have sleep trouble.
B．At least twenty percent of Americans don’’ t have enough sleep every night.
C．Our brains will force us to sleep when we have piled up too large a sleep deficit
D．Seven or eight hours of sleep every night is enough for people of different ages.
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