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 word emanating in paragraph 5 mean
A．Coming forth
B．Flowing out of
C．Belonging to
D．Starting
单项选择题
Internet provides ______.
A．consumers with international business opportunities
B．subscribers with a cheap and efficient link
C．formal roles to oversee its users
D．telecommunications services to users
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