单项选择题

A．which
B．what
C．how
D．because
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单项选择题
The word it (Par. 1, sentence 3) refers to ______.
A．pipeline
B．ocean
C．state
D．village
单项选择题
What is the major barrier to telesurgery
A．Distance
B．Advanced technology
C．Delay
D．Medical facilities
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