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
The relationship between exposure to ______ has not yet been determined.
A．ozone and fall in lung function
B．ozone and lung diseases such as asthma
C．nitrogen dioxide and worse lung function
D．smog and chronic bronchitis and emphysema
单项选择题
Figures showed that security screeners were ______ dangerous items.
A．able to detect
B．not able to detect
C．not effective in detecting
D．very effective in detecting
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