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
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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