Through modern medical science and technology, the average human life has been prolonged to 72 years.

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问题 Through modern medical science and technology, the average human life has been prolonged to 72 years.

选项 A、precipitated
B、stretched
C、changed
D、turned

答案B

解析 句意:凭借现代医疗科技,人类平均寿命已经延长至72年。prolong延长。precipitate加速,促成。stretch拉长,伸展;延续。change改变。turn转变。
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