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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.
According to the 1998 Aviation Medical Assistance Act, doctors who came to passengers’ aid________.
选项 A、do not have to be worried even if they give the patients improper treatment
B、will not be submitted to legal responsibility even if the patients didn’t recover
C、are assisted by advanced emergency medical kits
D、will be greatly respected by the patient and the crew
答案B
解析 本题的关键词是1998 Aviation Medical Assistance Act，定位到原文第四段第三句。选项B属于相同含义，原文第四段第三句提到过去抢救乘客的医生曾担心会被起诉 (getting sued)，就是说医生担心他们给予病人的医疗援助一旦没有生效就会遭到起诉，但自从法案的颁布为他们提供保护后，这种担心在某种程度上就消失了。由此可推断，《航空医疗救助法案》让医生在出现意外时能避免承担法律责任，故选项B正确。选项A属于主观推导，文中并没有提到治疗不当(improper treatment)。选项C、D属于答非所问，由第四段第四句可知，选项C “advanced emergency medical kits”是因为最近的立法规定(more recent legislation)才有的措施。选项D和原文表述的内容毫无关系。第四段：立法的完善使飞行中的紧急医疗情况正在好转。
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