单项选择题
Plants will emit an increased amount of heat when they are ______.
A.sprayed with pesticides
B.facing an infrared scanner
C.in poor physical condition
D.exposed to excessive sun rays
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单项选择题
The application of infrared scanning technology to agriculture met with some difficultiesdue to ______.
A.the lack of official support
B.its high cost
C.the lack of financial support
D.its failure to help increase production
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单项选择题
The passage implies that ______.
A.young people show interest in other aspects of wireless phone except talking
B.text-messaging has been a significant source of profit for phone carriers
C.the price of a new wireless phone appeals more to teenagers than adults
D.wireless phone companies are confident of the prospect of youth market
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