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A．significant
B．heavy
C．common
D．serious
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单项选择题Which of the following statements can be inferred from the passage

A．Despite the great prospect some scientists hold, artificial intelligence has achieved a modest Success.
B．With its commercial application in medical diagnosis, artificial intelligence has made a greatest breakthrough.
C．Artificial intelligence has found a wide application in almost every field of society.
D．It is too ideal to be true to make a machine think like human beings.

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