单项选择题

The first sentence of the text "here is a bright idea" tells us that the author is being _________.

A．ironical
B．critical
C．objective
D．emotional
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单项选择题
What is the author's attitude toward this new technique
A．Cautious
B．Tolerant.
C．Enthusiastic
D．Critical
单项选择题
Conventional X-rays mainly show the difference between _________.
A．bone and air
B．liver and pancreas
C．muscle and other body
D．heart and lungs
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