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
To understand what true happiness is, one must ______.
A．have as much fun as possible during one's lifetime
B．make every effort to liberate oneself from pain
C．put up with pain under all circumstances
D．be able to distinguish happiness from fun
单项选择题
From the last paragraph, we learn that envy sometimes stems from ______.
A．hatred
B．misunderstanding
C．prejudice
D．ignorance
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