单项选择题

It can be inferred from the passage that Seligman should be________.

A．an optimist
B．a pessimist
C．a psychologist
D．the writer of this passage
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单项选择题
The word undermine ( Para. 2 ) most probably means________.
A．go below
B．weaken
C．effect
D．destroy
单项选择题
A．powerB．energyC．vigorD．force
A．power
B．energy
C．vigor
D．force
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