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A．Once.
B．Twice.
C．Thrice.
D．Four times.
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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Which of the following can best describe the author’’s attitude towards the technological advances” we achieved in these years

A．Positive.
B．Negative.
C．Objective.
D．Defensive.