单项选择题
The application of infrared scanning technolgy to agriculture met with some difficulties due to ______.( )
A．the lack of official support
B．its high cost
C．its failure to help increase production
D．the lack of financial support
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单项选择题
Infrared scanning technology may be brought back into operation because of ______. ( )
A．growing concern about the excessive use of pesticides on crops
B．the desire of farmers to improve the quality of their produce
C．the forceful promotion by the Department of Agriculture
D．full support from agricultural experts
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单项选择题
The main difference between a nurse-manager and a head nurse is that the former ______. ( )
A．is a member of the Medical Executive Committee of the hospital
B．has to arrange the work shifts of the unit's nurses
C．can make decisions concerning the medical treatment of a patient
D．has full responsibility in the administration of the unit's nurses
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