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 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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