单项选择题

What does the expression "fall flat" in the last paragraph probably mean based on the context

A．serve their function
B．fail to take effect
C．meet the expected demands
D．dropped down and broken into pieces
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单项选择题
From the passage, we know that the writer ______.
A．thinks that scientists are on the point of achieving artificial intelligence
B．is in the full conviction that scientists have the competence to achieve artificial intelligence
C．remains doubtful of the fact that scientists have found real artificial intelligence
D．predicts with optimism that achieving artificial intelligence is now near at hand
单项选择题
All of the following can be considered some of the obstacles artificial intelligence can hardly get over EXCEPT ______.
A．common sense
B．flexibility
C．speech
D．rigid approach
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