单项选择题

The word "it" (Par. 1, sentence 3) refers to ______.

A．pipeline
B．ocean
C．state
D．village
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单项选择题
What is the major barrier to telesurgery
A．Distance
B．Advanced technology
C．Delay
D．Medical facilities
单项选择题
The title that best expresses the main idea is ______.
A．How The Second Revolution in Surgery Comes Out
B．The Telesurgery Revolution
C．A Patient Was Saved
D．Dream Comes True
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