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  3. Usually a physician travels a lot. As a physician, I spend a lot of time on planes listening for that dreaded "Is there a doctor

Usually a physician travels a lot. As a physician, I spend a lot of time on planes listening for that dreaded "Is there a doctor

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问题     Usually a physician travels a lot. As a physician, I spend a lot of time on planes listening for that dreaded "Is there a doctor on board?" announcement. I’ve been【C1】______only once — for a woman who had merely fainted. But the accident made me quite curious about how often this kind of thing happens. I wondered what I would do if confronted with a real midair medical emergency — without access【C2】______a hospital staff and the usual emergency equipment. So【C3】______the New England Journal of Medicine last week published a study about in — flight medical events, I read it with interest.
    The study estimated that there are a(n) 【C4】______of 30 in-flight medical emergencies on U.S. flights every day. Most of them are not【C5】______: fainting and dizziness are the most frequent complaints. But 13% of them — roughly four a day — are serious enough to【C6】______a pilot to change course. The most common of the serious emergencies【C7】______heart trouble, strokes, and difficulty breathing.
    Let’s face it: plane rides are stressful. For starters, cabin pressures at high altitudes are set at roughly【C8】______they would be if you lived at 5,000 to 8,000 feet above sea level. Most people can tolerate these pressures pretty easily, but passengers with heart disease may experience chest pains as result of the reduced amount of oxygen flowing through their blood. Another common in-flight problem is deep venous thrombosis — the so-called economy class syndrome.【C9】______happens, don’t panic. Things are getting better on the in-flight-emergency front. Thanks to more recent legislation, flights with at【C10】______one attendant are starting to install emergency medical kits to treat heart attacks.
【C8】
选项 A、who
B、what
C、which
D、that
答案B
解析 介词at后面的关系代词这里可以用which和what，而根据句意应选what。
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