单选题
The sentence "our life span outpaces our usefulness" means we can live longer ______.
A、
and make progress
B、
and do more work
C、
but move slowly
D、
but become useless
【正确答案】
D
【答案解析】
[分析] 细节题型。 根据第三段的最后一句It appears that our life span is outpacing our usefulness in society．outpace“超过”。
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