单项选择题

What is the main idea of this article

A．A new way of detecting cancer.
B．The history of thermography.
C．The value of thermography.
D．How to interpret a thermogram.
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单项选择题
What does the thermography depend on A) Television cameras C) Photograph negatives B) Infrared energy D) Given temperatures
A．What does the thermography depend on
B．Television cameras
C．Infrared energy
D．Photograph negatives
E．Given temperatures
单项选择题
Producing a thermogram is ______.
A．expensive because of the high voltage the machine requires
B．a time-consuming process
C．inexpensive after the machine is purchased
D．an unsafe procedure
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