单项选择题

Why was electronic mail unsuccessful in the past

A．Because its users subscribed to different, unconnected mail services.
B．Because people thought its services expensive.
C．Because people couldn't afford the personal computer.
D．Because computer networks used to disconnect globally.
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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.
单项选择题
What does the word emanating in paragraph 5 mean A) Coming forth C) Flowing out of B) Belonging to D) Starting
A．What does the word "emanating" in paragraph 5 mean
B．Coming forth
C．Belonging to
D．Flowing out of
E．Starting
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