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 sentence the seniors create a sense of meaning for themselves means the seniors ______.
A．acquire a new meaning of their lives
B．understand the meaning of the web
C．create a web site for themselves
D．add a new meaning to the web
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