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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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 boss is a jerk. These words are used here to show________.
A．how some bosses act displeasingly
B．how optimists explain some bad events
C．how pessimists think about the unhappy things around them
D．how the writer suggests people should do when facing something unpleasant
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