赞题库-背景图

单项选择题

According to the passage, which of the following is not the factor determining the risk

A．the sate and type of asbestos
B．the choice of tools
C．ventilation of working environment
D．the medicine workers took

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热门试题

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

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 quantifies
C．even if it is used in small quantities
D．if they are used when wet rather than dry