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

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

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

答案D

解析 (prolongation延长)。句意为：未来的科学发现在多大的程度上使人类延长寿命?A．increase增加；B．expansion张开，伸展；C．growth生长。

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