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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单项选择题

What does the thermography depend on

A．Television cameras
B．Infrared energy
C．Photograph negatives
D．Given temperatures

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.