单项选择题

According to the passage, which of the following factors could influence dust formation

A．humidity of asbestos that is used
B．the state and type of asbestos
C．ways people use asbestos
D．weather
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单项选择题
If it is left______, this fast spreading disease is likely to affect millions of Asian and African children, including more and more injured grown-ups.
A．unchecked
B．uncontrolled
C．aggravated
D．contaminated
单项选择题
A doctor's obligation when he can no longer______ the approach of death is to make the patient comfortable, including easing his pain.
A．hang around
B．hang on
C．hold back
D．hold on
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