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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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
单项选择题
The expression scratch the surface most probably means ______.
A．think hard in a puzzled way
B．deal with a problem thoroughly
C．treat a subject without being thorough
D．work out a solution for a problem easily
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