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
One of the recommendations given by the council was that _________.
A．asbestos should be banned in building industry
B．steps be taken to prevent loose fibers of asbestos entering the air
C．vacuum cleaner be taken by every worker
D．the cost of asbestos be increased so as to drive it out of the market
单项选择题
Exposure to asbestos fibers can cause cancer _________.
A．only when asbestos is used in building industry
B．only when it is used in large quantities
C．even if it is used in small quantities
D．if they are used when wet rather than dry
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