单选题 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. (1) trained marathon runners are not immune to fatal heart attacks. But no one knows just (2) common these sudden deaths linked to exercise are. The registration and investigation of such (3) is very patchy; only a national survey could determine the true (4) of sudden deaths in sports. But the climate of medical opinion is shifting in (5) of exercise, for the person recovering from a heart attack as (6) as the average lazy individual. Training can help the victim of a heart attack by lowering the (7) of oxygen the heart needs at any given level of work (8) 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, (9) particular, be screened for signs of heart disease before (10) vigorous exercise?

单选题 A. Then B. Though C. Since D. Even
【正确答案】 D
【答案解析】[解析] 此处空格处是说即使是受过训练的马拉松长跑运动员，因此D项Even(甚至，即使……也)为正确答案。
单选题 A. why B. how C. if D. what
【正确答案】 B
【答案解析】[解析] 横线处是说没人知道这些骤然死亡与锻炼之间的联系有多普通。因此B项common(共同的，公共的，公有的。普通的)为正确答案。
单选题 A. runners B. exercises C. patients D. cases
【正确答案】 D
【答案解析】[解析] 横线处是说这类事例的报道和调查非常不完整。D项cases(案例)为正确答案。
单选题 A. initiation B. evidence C. incidence D. indication
【正确答案】 B
【答案解析】[解析] 横线处是说只有国家的调查能够确定运动中骤然死亡的真实依据。B项evi-dence(迹象，根据)为正确答案。
单选题 A. favor B. positive C. inclination D. indication
【正确答案】 A
【答案解析】[解析] 横线处是说赞成锻炼的意见正在转变。短语in favor of(赞同．有利于)符合题意。因此A项为正确答案。
单选题 A. good B. well C. much D. far
【正确答案】 B
【答案解析】[解析] 横线处是说与缺乏体育锻炼的人恢复得一样好。B项well(好，令人满意地．充分地)正确答案。
单选题 A. weight B. amount C. degree D. quality
【正确答案】 A
【答案解析】[解析] 横线处是说减少心脏对氧需求的负担。A项weight(重要(性)，势力，负担，重累)为正确答案。
单选题 A. however B. because C. but D. so
【正确答案】 D
【答案解析】[解析] 横线处是说因此病人能够做得更多。D项so(因而，所以)为正确答案。
单选题 A. at B. to C. for D. in
【正确答案】 D
【答案解析】[解析] 横线处是说特别是中年人。短语in particular(特别)为正确答案。
单选题 A. taking up B. trying on C. getting over D. doing with
【正确答案】 A
【答案解析】[解析] 横线处是说在开始进行猛烈的锻炼之前。A项take up(开始从事，专注于)为正确答案。