单项选择题

Exposure to asbestos fibers is harmful to people's health,______

A．so the use of asbestos is limited
B．but asbestos will continue to be used for a long time to come
C．so other new kinds of materials are under development
D．but they will not be so when ventilation devices are used
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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
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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