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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.
【P5】
选项
答案Therefore改为However
解析 前一句提到“过度呼吸”不会暗示长期性的健康问题，而此句则说“呼吸过快”可能是肺部疾病的征兆之一。这两句之间是转折关系，而不是因果关系，故选择连接词However。
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