【正确答案】
D
【答案解析】[听力原文]
Running is one of the finest sports activities for any girl or boy. The basic training for any kind of running, whether it is for short or long distances, is simply to run, to cover the miles. Slow running can be done at any time and any place. A boy can run before breakfast, he can run in the dark, or he can run at any time of the day. Nor does he need a special place or any equipment. A person who can run for miles is establishing complete bodily fitness, not merely improving his leg muscles. Running depends on the heart and lungs just as much as on the legs, and so a runner becomes an entirely fit person. This enables him to do well in other sports, too, for nearly all of them depend on the same qualities. Running appeals as much to girls as to boys. It can be done in groups or alone, and it is one kind of physical training that can be carried on to any age.