【正确答案】 A

【答案解析】[解析] “Exercise as a part of daily life did not catch on until the late 1960swhen re search by military doctors began to show the health benefits of doing regular physical exercises．”句意为：“直到1960年军医研究表明定期进行体育锻炼对身体有好处，锻炼身体作为日常生活的一部分才开始流行。”答案应该选A。