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
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
单项选择题
What is the author trying to tell us
A．Happiness often goes hand in hand with pain.
B．One must know how to attain happiness.
C．It is important to make commitments.
D．It is pain that leads to happiness.
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