题目内容：
根据下列材料，回答题Scientists Develop Ways of Detecting Heart Attack
German researchers have come up with a new generation of defibrillators and early-warningsoftware aimed at offering heart patients greater (51) from sudden death from cardiac arrest.
In Germany alone around 100000 people die annually (52) a result of cardiac arrest and many of these cases are caused by disruption to the heart's rhythm. Those most at (53) are patients who have already suffered a heart attack, and for years the use of defibrillators has proved useful in (54) life-threatening disruption to heart rhythms and correcting them automatically by intervening within seconds. These devices (55) on a range of functions, such as that of pacemaker (起搏器).
Heart specialists at Freiburg's University Clinic have now achieved a breakthrough with an implanted defibrillator (56) of generating a six-channel electrocardiogram (ECG) within the body. This integrated system allows (57) diagnosis of acute blood-flow problems and a pending heart attack. It will be implanted in (58) for the first time this year. Meanwhile, researchers at the Fraunhofer Institute for Applied Mathematics in Kaiserslautem have developed new computer software that (59) the evaluation of ECG data more precisely.
The overwhelming majority of patients at risk will not have an implanted defibrillator and must for this (60) undergo regular ECGs. "Many of the current programs only get into (61) a linear correlation of the datA．We are, however, making use in a non-linear process (62) reveals the chaotic patterns of heart beats as an open and complex system," Hagen Knaf says, "In this way changes in the heart (63) over time can be monitored and individual variations in patients taken into account. " An old study of ECG data, based upon 600 patients who had (64) a subsequent heart attack, enabled the researchers to compare risks and to show that the new software evaluates the (65) considerably better.
A．service
B．discount
C．protection
D．advice
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