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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 seriousemergencies 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 de-vice 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 ft or climb a flight of stairs without getting winded, you’ll probably do just fine. Having a doctor close by doesn’t hurt, either.
We can learn from Paragraph 3 that deep venous thrombosis usually happens because _____.
选项 A、the economy class is not spacious enough
B、there are too many economy-class passengers
C、passengers are not allowed to walk during the flight
D、the low pressure in the cabin prevents blood flowing smoothly
答案A
解析 因果细节题。第三段最后一句建议乘客有机会就多运动或伸展腿部，由此可以推断该段第二句中的cramped表明经济舱的空间狭窄，因此A项为本题答案。
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