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
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单项选择题
Irritable and inflamed lungs are also seen in people with ______.
A．asthma
B．lung diseases
C．good health
D．weak health
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
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