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  3. A study published in The New England Journal of Medicine estimated that there are an average of 30 in-flight medical emergencies

A study published in The New England Journal of Medicine estimated that there are an average of 30 in-flight medical emergencies

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问题     A study published in The New England Journal of Medicine estimated that there are an average of 30 in-flight medical emergencies on U.S. flights every day. Most of them are not grave; fainting, dizziness and hyperventilation are the most frequent complaints. But 13％ of them—roughly four a day—are serious enough to require a pilot to change course. The most common of the serious emergencies include heart trouble (46％), strokes and other neurological problems (18％), and difficult breathing (6％).
    Let’s face it: plane riders are stressful. For starters, cabin pressures at high altitudes are set at roughly what 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 a result of the reduced amount of oxygen flowing through their blood. Low pressure can also cause the air in body cavities to expand—as much as 30％. Again, most people won’t notice anything beyond mild stomach cramping. But if you’ve recently had an operation, your wound could open. And if a medical device has been implanted in your body—a splint, a tracheotomy tube or a catheter—it could expand and cause injury.
    Another common in-flight problem is deep venous thrombosis—the so-called economy-class syndrome. When you sit too long in a cramped position, the blood in our legs tends to clot. Most people just get sore calves. But blood clots, left untreated, could travel to the lungs, causing breathing difficulties and even death. Such clots are readily prevented by keeping blood flowing; walk and stretch your legs when possible.
    Whatever you do, don’t panic. Things are looking up on the in-flight-emergency front. Doctors who come to passengers’ aid used to worry about getting sued; their fears have lifted somewhat since the 1998 Aviation Medical Assistance Act gave them "good Samaritan" protection. And thanks to more recent legislation, flights with at least one attendant are starting to install emergency medical kits with automated defibrillators to treat heart attacks.
    Are you still wondering if you are healthy enough to fly? If you can walk 150 feet, or climb a flight of stairs without getting winded, you’ll probably do just fine. Having a doctor close by doesn’t hurt, either.
The phrase "getting winded" (Line 2. Para. 5) is closest in meaning to________.
选项 A、falling over
B、being out of breath
C、spraining the ankle
D、moving in a curving line
答案B
解析 题干已明确将答题位置定位到原文第五段第三句。原文第五段第三句指出了检测身体是否足够健康可以乘坐飞机的方法。结合全文中提到的高空机舱中气压低、含氧量低的特点，可以推断“getting winded”应指气喘吁吁或上气不接下气，而这与选项B “being 0ut of bream”属于相同含义。其他三个选项意思均不符。第五段：身体健康、医生在旁都能增加飞行的安全系数。
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