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Artificial hearts have long been the stuff of science fiction. In "Robocop", snazzy cardiac devices are made by Yamaha and Jense

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问题     Artificial hearts have long been the stuff of science fiction. In "Robocop", snazzy cardiac devices are made by Yamaha and Jensen, and in "Star Trek", Jean-Luc Picard, captain of the Enterprise, has one implanted in the year 2328. In the present day, however, their history has been more chequered. The first serious attempt to build one happened in the 1980s, when Jarvik-7, made by Robert Jarvik, a surgeon at the University of Utah, captured the world’s attention. But Jarvik-7 was a complicated affair that needed to be connected via tubes to machines outside the body. The patient could not go home, nor even turn around in bed. Scientists have tried many other designs, but all were seen as temporary expedients intended to tide a patient over until the real thing became available from a human donor.
    That may be about to change. This week, America’s Food and Drug Administration gave its approval to a new type of artificial heart made by Abiomed, a firm based near Boston. The agency granted a "humanitarian device exemption" , a restricted form of approval that will allow doctors to implant the new device in people whose hearts are about to fail but who cannot, for reasons such as intolerance of the immunosuppressive drugs needed to stop rejection, receive a transplant. Such people have a life expectancy of less than a month, but a dozen similarly hopeless patients implanted with Abiomed’s heart survived for about five months.
    Unlike Dr. Jarvik’s device, this newfangled bundle of titanium and polyurethane aims to set the patient free. An electric motor which revolves up to 10,000 times a minute pushes an incompressible fluid around the Abiomed heart, and that fluid, in turn, pushes the blood—first to the lungs to be oxygenated, and then around the body. Power is supplied by an electric current generated in a pack outside the body. This induces current in the motor inside the heart. All diagnostics are done remotely, using radio signals. There are no tubes or wires coming out of the patient.
    The charger is usually plugged into the mains, but if armed with a battery it can be carried around for hours in a vest or backpack, thus allowing the patient to roam freely. Most strikingly, the device’s internal battery can last half an hour before it needs recharging. That allows someone time to take a shower or even go for a quick swim without having to wear the charger.
    Abiomed’s chairman, Michael Minogue, does not claim that his firm’s product will displace human transplants. Even so, the firm has big ambitions. It is already developing a new version that will be 30% smaller (meaning more women can use it) and will last for five years. That should be ready by 2008—320 years earlier than the writers of "Star Trek" predicted.
The best title of the text could be
选项 A、The Stuff of Science Fiction.
B、The History of Artificial Hearts.
C、The Change of Human Donor.
D、A Promising New Artificial Heart.
答案D
解析 这是一道中心主旨题。本题的答案信息来源在原文第二段的第一、二句，其大意是：“这也许就要改变了。本周，美国食品卫生管理局批准一种新型的人造心脏，该心脏由设在波士顿附近的一家名为Abiotaed的公司生产制造。”原文第二段是全文的中心主旨段，第二段的第一、二句是全文的中心主旨句。由这两句话来推断本文的正确选项是D。考生在阅读时要注意首先识别中心主旨段和中心主旨句。
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