单项选择题

What is the advantage in using thermography to detect cancer

A．It is very accurate in detecting breast cancer.
B．It can indicate very small cancers.
C．It adds to doctors' skills in treating disease.
D．It is helpful to save lives.

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单项选择题

What does the word emanating in paragraph 5 mean

A．Coming forth
B．Belonging to
C．Flowing out of
D．Starting

单项选择题

Why is electronic mail widely used in business

A．Because it can speed up the sending of messages.
B．Because it is a fashionable gadget to the businessman.
C．Because it is cheap and efficient.
D．Because it is a part of business life.