请教一道英文阅读理解题,Q.Why were Stone Age razors equally as disposabl
请教一道英文阅读理解题, Q.Why were Stone Age razors equally as disposable as modern ones? A.They were also thin slivers of metal B.They were fragile C.There was no lack of them D.They didn't shave well 请问哪个才是正确答案,如何理解所选的正确答案呢?