2. 外语
  3. ______is a good form of exercise for both the old and the young.

______is a good form of exercise for both the old and the young.

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问题 ______is a good form of exercise for both the old and the young.
选项 A、Walk
B、To walk
C、Walking
D、The walk
答案C
解析 句子大意为：散步不论对老年人还是年轻人来说都是一种良好的锻炼形式。根据句意和语法可知，此处缺少主语，所以应填动名词形式。据此判断，正确答案是C。
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