单项选择题

The application of infrared scanning technology to agriculture met with some difficulties
due 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
单项选择题
What can you infer about some phone carders from the passage
A．They want to get additional download profit from teenagers.
B．They are faced with intense competition in the market now.
C．They try to expand the sales of phones among adult users.
D．They provide some free minutes for the young people.
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