单项选择题

With respect to the advances in studying lie detection scientists think highest of ______.

A．simplifying the entire process of detection
B．the mechanic design of thermal cameras
C．substituting new approaches for polygraph
D．the discovery that one blushes while telling lies
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单项选择题
It can safely be inferred that Sept. 11 ______.
A．confirmed the failure of polygraph in detecting deception
B．made American begin to know about lie detection
C．gave a spur to the study of lie detection in the United States
D．triggered America's development of lie detectors
单项选择题
According to the passage thermal cameras ______.
A．have yet to be put to general use
B．have proved successful since 2 years ago
C．have to undergo tests at least half a year
D．have been playing a dominant role in lie detection
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