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单项选择题

Which of the following is NOT mentioned as a possible cause of lung diseases

A．The burning of coal
B．Long-term exposure to smog
C．Exposure to nitrogen dioxide
D．Attending school camps
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单项选择题Which of the following is NOT mentioned as a possible cause of lung diseases

A．The burning of coal
B．Long-term exposure to smog
C．Exposure to nitrogen dioxide
D．Attending school camps

单项选择题Which of the following is NOT the result of laboratory experiments

A．Low concentrations
B．Fall in lung function
C．Irritability of the lungs
D．Air way inflammation