单项选择题


A．turning
B．rolling
C．twisting
D．rotating
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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
单项选择题
The word undermine ( Para. 2 ) most probably means________.
A．go below
B．weaken
C．effect
D．destroy
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