单项选择题

"Scholarly skywriting" has all the following advantages except _________.

A．avoidance of copyright trouble
B．swift transmission of thought
C．utilization of the wisdom of other individuals
D．easy updating of manuscripts
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单项选择题
According to the report, dust formation can be reduced when _________.
A．asbestos is damp
B．dry asbestos is employed
C．workers wear protective clothing
D．workers use asbestos in the open air
单项选择题
By scholarly skywriting , the author means scholars _________.
A．get new ideas from discussions through electronic networks
B．have their scientific papers openly published on the Net
C．are free to express their ideas on the line
D．create, polish and publish their ideas on the line
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