单项选择题

In order to apply pesticide spraying precisely, we can use infrared scanning to ______.

A．estimate the damage to the crops
B．draw a color-coded map
C．measure the size of the affected area
D．locate the problem area
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单项选择题
Farmers can save a considerable amount of pesticide by ______.
A．resorting to spot-spraying
B．consulting infrared scanning experts
C．transforming poisoned rain
D．detecting crop problems at an early date
单项选择题
The example of an Avril Lavigne phone is given to illustrate that ______.
A．the new wireless phone has a bigger memory than the average one
B．music-loving,fashionable teenagers are its target customers
C．the functions of current mobile phones are very changeable
D．its price is not very high concerning its various functions
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