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 quantifies
C．even if it is used in small quantities
D．if they are used when wet rather than dry

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热门试题

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

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