Old adults who have a high level of daily activities have more energy and a lower death rate compared with (in comparison with) those less active.

【参考答案】

那些日常做大量运动的老年人与那些不怎么运动的老年人相比，精力更旺盛、死亡率更低。[解析] 该句同时出现了比较级和定语从句......

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