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  3. Healthy adults take approximately 10-14 breaths per minute, but some people breathe 20 or more times—this can lead to feeling

Healthy adults take approximately 10-14 breaths per minute, but some people breathe 20 or more times—this can lead to feeling

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问题     Healthy adults take approximately 10-14 breaths per minute,
but some people breathe 20 or more times—this can lead to feeling
out of breath and a range of other symptoms such as tingling in the
fingers and around the lips, heart palpitations, tiredness, inability
to concentrate on and irritable bowel syndrome, explains Fiona【M1】______
Troup, a physiotherapist at Six Physio in London.
    The symptoms are a sign you’re breathing through the mouth
instead of doing deeper breathing through the nose. This leads a【M2】______
fall in carbon dioxide levels in the blood—as a result of, oxygen【M3】______
can’t be released to the muscles and organs.
    This causes muscle spasms, often in the colon where can【M4】______
exacerbate or lead to IBS; meanwhile if the brain is derived of【M5】______
sufficient oxygen levels, it can cause confusion and dizziness.
    "Fast breathing is basically a bad habit, often results from【M6】______
period of elevated stress, back or neck pain, emotional trauma or【M7】______
surgery," says Ms Troup. One seminal study suggested as many as
10 per cent of those attending general practice suffered this【M8】______
problem. Over-breathing, as it is known, shouldn’t have any
long-term health implications, says Stephen Spiro, professor of
respiratory medicine at University College London Hospitals and
deputy chair of the British Lung Foundation. Therefore, rapid【M9】______
breathing and breathless can be a sign of lung disease, particularly【M10】______
asthma and bronchitis. With these conditions, the airways in the
lungs narrow, so it’s physically harder for the air to travel in and
out.
【M7】
选项
答案period一periods
解析 语法错误。名词的单数形式通常不会单独使用，一般应加上一定的限定词，修饰词或者以名词的复数形式出现．而此处要表达的意思是“呼吸过快经常来自于周期性的压力升高．颈部或背部的疼痛，精神创伤或手术”，所以应该选用period的复数形式，表示“周期性”。
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