单项选择题

It can be inferred from the passage that the real danger comes from______

A．the asbestos dust that people take in
B．the contact of the workers skin with asbestos particles
C．the inferior quality of the asbestos itself
D．the excessive use of man-made asbestos material
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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
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 he reduced significantly
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