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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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

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