To what extent will future scientific discoveries make possible the______of the human life span?

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问题 To what extent will future scientific discoveries make possible the______of the human life span?

选项 A、increase
B、expansion
C、growth
D、prolongation

答案D

解析 近似名词辨析。prolongation意为“延长,拉长”;increase意为“增加;增大”;expansion意为“扩大,扩充”;growth意为“增长,增加;生长”。
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