单项选择题

A．He ate all the food.
B．He cleaned the refrigerator.
C．He worked day and night.
D．He had a big lunch.
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单项选择题
Which of the following statements is true according to Peter Watson in this passage
A．There have been no innovations at all in the fifty years since 1950.
B．Most scientific research is only continuation of the previous studies since 1950.
C．The advanced technologies are only small things that have not changed the way we think.
D．We actually haven’’ t made any progress in the past 50 years because of fewer innovations.
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.
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