题目内容

The common symptoms of asthma include _________.

A. wheezing
B. coughing
C. breathlessness
D. chest tightness

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Common triggers of asthma include_________.

A. cigarette smoke
B. chemical irritants
C. pollen
D. air pollution

Please write down one word that shares the same meaning with“breathe in” : __________

Please write down one word that shares the same meaning with "breathe out” : __________

If you ________, you don't breathe out after you breathe in.(three words)