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Magnetic resonance imaging(MRI)—a noninvasive diagnostic procedure—can be used to identify blockages in the coronary arteries. I
Magnetic resonance imaging(MRI)—a noninvasive diagnostic procedure—can be used to identify blockages in the coronary arteries. I
admin
2014-10-21
31
问题
Magnetic resonance imaging(MRI)—a noninvasive diagnostic procedure—can be used to identify blockages in the coronary arteries. In contrast to angiograms—the invasive procedure customarily used—MRI’s pose no risk to patients. Thus, to guarantee patient safety in the attempt to diagnose arterial blockages, MRI’ s should replace angiograms in all attempts at diagnosing coronary blockages. Which of the following, if true, would most support the recommendation above?
选项
A、Angiograms can be used to diagnose conditions other than blockages in arteries.
B、MRI’ s were designed primarily in order to diagnose blockages in the coronary arteries.
C、Angiograms reveal more information about the nature of a blockage than an MRI can.
D、An MRI is just as likely as an angiogram to identify an arterial blockage.
E、Some patients for whom an angiogram presents no risk are unwilling to undergo an MRI.
答案
D
解析
本题推理为:因为MRI不会对病人产生危害,因此在诊断动脉堵塞时应用MRI代替angograms。如果MRI与angiogram一样能确认动脉堵塞,正如(D)所说,那么上面推理成立可能性就增加,所以(D)正确,支持了上面建议;(A)、(C)、(E)都从某程度上反对上述建议;(B)易误选,但(B)仅仅说明MRI主要是用来诊断冠状动脉堵塞的,并没有说明angiogram怎么样,有可能angiogram也可以被用来诊断冠状动脉堵塞的。所以(B)为无关选项,请认真体会(B)错的原因。
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