单项选择题

What Doris Lessing said helps to support the idea that______.

A．he is one of the world' s great revisers
B．he is not a good writer
C．revising is very important
D．many writers are unwilling to revise their works
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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 significantly
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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