What is Chronic obstructive pulmonary disease?

Is chronic obstructive pulmonary disease a kind of common diseases?

A. 对
B. 错

Doctors can use a spirometer to perform a quick breathing test to see if people have COPD.

A. 对
B. 错

COPD has 2 most common forms. They areand.

What is the pathogenic cause of COPD?

What is the pathogenic cause of COPD?

A. smoking
B. air pollution
C. genetic factors
D. bacteria infection

What are the signs of COPD?

A. COPD often follows a non-stop cough.
B. At the same time, the mucus often swells.
C. People who have got COPD usually feel difficult to breathe.