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  3. It happens to every medical student sooner or later. You get a cough that persists for a while. Ordinarily, you would just ignor

It happens to every medical student sooner or later. You get a cough that persists for a while. Ordinarily, you would just ignor

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问题     It happens to every medical student sooner or later. You get a cough that persists for a while. Ordinarily, you would just ignore it—but now armed with your rapidly growing medical knowledge, you can’t help worrying. The cough could mean just a cold, but it could also be a sign of lung cancer.
    For doctors in training, nurses and medical journalists, hypochondria is an occupational danger. The feeling usually passes after a while, leaving only a funny story to tell at a dinner party. But for the tens of thousands who suffer from true hypochondria they live in constant terror that they are dying of some awful disease, or even several awful diseases at once. Doctors can assure them that there’s nothing wrong, but since the cough is real, the assurances fall on deaf ears. And because no physician or test can offer a 100% guarantee that one doesn’t have cancer, a hypochondriac always has fuel to feed his or her worst fears.
    Hypochondriacs don’t harm just themselves; they block the whole healthcare system. Although they account for only about 6% of the patients who visit doctors every year, they tend to burden their physicians with frequent visits that take up excessive amounts of time. And the problem may be worse, thanks to the popularity of medical information on the Internet. They go on the Web and learn about new diseases and new presentations of old diseases that they never even knew about before. Doctors have taken to calling this phenomenon cyberchondria (网络疑病症).
The problem becomes worse due to ______.
选项 A、the increasing number of patients
B、the widespread medical knowledge on the Internet
C、the patients’ regular visits to doctors that occupy too much time
D、new diseases and symptoms emerge constantly
答案B
解析 推理判断题。句中thanks to是讽刺的用法，引出原因，故选项B正确。本题考查因果关系，要辨别明显的因果关系，只要关注文中是否有because，reason，due to，thanks to，result等词即可。
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