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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 feelin

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

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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 range of
    other symptoms such as tingling in the fingers and around the lips, heart
    palpitations, tiredness, inability to concentrate on and irritable bowel          【P1】________
    syndrome, explains Finona 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 fall in carbon dioxide levels in the blood—as a result of,          【P2】________
    oxygen can’t be released to the muscles and organs.
    This causes muscle spasms, often in the colon which can exacerbate or
    lead to IBS: meanwhile if the brain is derived of sufficient oxygen levels,       【P3】________
    it can cause confusion and dizziness.
    "Fast breathing is basically a bad habit, often resulting from period of elevated 【P4】________
    stress, back or neck pain, emotional trauma or surgery," says Ms. Troup.
    One seminal study suggested as many as 10 per cent of those attending
    general practice suffered from this 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 breathing and breathlessness can be a sign of lung disease,      【P5】________
    particularly 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.
【P4】
选项
答案period改为periods
解析 period为可数名词单数形式，按照语法规则，可数名词单数形式不能单独使用，一般应该加上一定的限定词、修饰词或者以名词复数的形式出现，因此需要改为a period of(一段时期的)或是periods of(周期性的)。根据文中上下文内容判断，此处所要表达的意思是“呼吸过快经常缘于周期性的高度压力”，故应该用periods。
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