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

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

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