单项选择题

According to the passage, which of the following is not the factor determining the risk

A．the sate and type of asbestos
B．the choice of tools
C．ventilation of working environment
D．the medicine workers took
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单项选择题
According to the passage, which of the following factors could influence dust formation
A．humidity of asbestos that is used
B．the state and type of asbestos
C．ways people use asbestos
D．weather
单项选择题
Evidence from the economists and the building industries shows that______.
A．exposure to asbestos fibers is cancer causing
B．asbestos is in extensive use in building industry
C．use of asbestos is being reduced gradually
D．exposure to asbestos fibers can be reduced significantly
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