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

<上一题目录下一题>

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

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 worker's skin with asbestos particles
C．the inferior quality of the asbestos itself
D．the excessive use of man-made asbestos material.