第32题: [单项选择]To what extent will future scientific discoveries make possible the ______ of human life span A. increase B. expansion C. growth D. prolongation 参考答案:D 答案解析:(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。