单项选择题


A．diseases
B．symptoms
C．signs
D．defects
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单项选择题
A．attainB．shedC．retrieveD．seek
A．attain
B．shed
C．retrieve
D．seek
单项选择题
Which of the following is within the capacity of the artificial nose being developed
A．Performing physical examinations.
B．Locating places which attract terrorists.
C．Detecting drugs and water contamination.
D．Monitoring food processing.
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