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下面的短文有l5处空白，请根据短文内容为每处空白确定l个最佳选项。
回答题:
Exercise Being Good or Bad
Can exercise be a bad thing? Sudden death during or soon after strenuous exertion on the squash court or on the army training grounds, is not unheard of. 51 trained marathon runners are not immune to fatal heart attacks. But no one knows just 52 common these sudden deaths linked to exercise are. The registration and
investigation of such 53 is very patchy; only a national survey could determine the true 54 of sudden deaths in sports. But the climate of medical opinion is shifting in 55 of exercise, for the person recovering from a heart attack as 56 as the average lazy individual. Training can help the victim of a heart attack by
lowering the 57 of oxygen the heart needs at any given level of work 58 the patient can do more before reaching the point where chest pains indicate a heart starved of oxygen. The question is, should middle-aged people, 59 .particular, be screened for signs of heart disease before 60 vigorous exercise?
Most cases of sudden death in sport are caused by lethal arrhythmias in the beating of the heart, often in people 61 undiagnosed coronary heart disease. In North America 62 over 35 is advised to have a physical check-up and even an exercise electrocardiogram. The British, on the whole, think all this testing is
unnecessary. Not many people die from exercise, 63 , and ECGs ( 心电图 ) are notoriously inaccurate. However, two medical cardiologists at the Victoria Infirmary in Glasgow, advocate screening by exercise ECG for people over 40, or younger people 64 at risk of developing coronary heart disease. Individuals showing a particular abnormality in their ECGs 65 , they say, a 10 to 20 times greater risk of subsequently developing signs of coronary heart disease, or of sudden death.
51 第51题应选：
A.Then
B.Though
C.Since
D.Even
参考答案：D
参考解析：
【解析】句意为：__________是受过训练的马拉松长跑运动员也不能避免致命的心脏病突发。四个选项：then“然后”;though“虽然”;since“自从，既然”;even“甚至，即使”。
52 第52题应选：
A.why
B.how
C.if
D.what
参考答案：B
参考解析：
【解析】句意为：没人知道这些骤然死亡与锻炼之间的联系有__________普通。四个选项：why“为什么”;how“怎样，如何，多么”;if“如果”;what“什么”。
53 第53题应选：
A.runners
B.exercises
C.patients
D.cases
参考答案：D
参考解析：
【解析】句意为：这类__________的报道和调查非常不完整。四个选项：runners“跑步者”;exercises“锻炼，练习”;patients“病人”;cases“案例”。
54 第54题应选：
A.initiation
B.evidence
C.incidence
D.indication
参考答案：B
参考解析：
【解析】句意为：只有国家的调查能够确定运动中骤然死亡的真实__________。四个选项：initiation“创始，发起”;evidence“迹象，根据”;incidence“发生率，发生”;indication“表明，象征，迹象”。
55 第55题应选：
A.favor
B.positive
C.inclination
D.indication
参考答案：A
参考解析：
【解析】句意为：__________锻炼的意见正在转变。四个选项：favor“有利于”，短语in favor of“赞同，有利于”;positive“积极的”;inclination“爱好，意向，倾向”;indication“表明，迹象，象征”。
56 第56题应选：
A.good
B.well
C.much
D.far
参考答案：B
参考解析：
【解析】句意为：与缺乏体育锻炼的人恢复的一样__________。四个选项：good“好的”;well“好，满意地，充分地”;much“非常，差不多，几乎”;far“遥远地，很，非常”。
57 第57题应选：
A.weight
B.amount
C.degree
D.quality
参考答案：B
参考解析：
【解析】句意为：减少心脏对氧需求的__________。weight“负担，重累”;amount“数量，总额”;degree“程度，学位”;quality“质量”。
58 第58题应选：
A.however
B.because
C.but
D.so
参考答案：D
参考解析：
【解析】句意为：__________病人能够做得更多。四个选项：however“不管怎样，无论如何”;because“因为”;but“但是”;so“因而，所以”。
59 第59题应选：
A.at
B.to
C.for
D.in
参考答案：D
参考解析：
【解析】句意为：__________是中年人。四个选项中，只有in可与particular构成固定短语in particular“特别”。
60 第60题应选：
A.taking up
B.trying on
C.getting over
D.doing with
参考答案：A
参考解析：
【解析】句意为：在__________进行“剧烈”的锻炼之前。taking up“开始从事，专注于”;try on“试穿，耍花招”;get over“使度过，穿过”;do with“处理，对待”。
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