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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热门试题

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 association between ______ has not yet been found in Australi

A． ozone levels and hospital admissions for asthmaB. hazy days and more asthma attacks in childrenC. the levels of particles in the air and death ratesD. high levels of pollution and more. symptoms