单项选择题

What is a terrible tool for activities such as sketching and painting

A．Technology
B．Typewriter
C．Text
D．The web
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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
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
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