题目选项分析

Because the collagen fibers in skin line up in the direction of tension, surgical cuts made along these so-called Langer's lines sever fewerfibers and is less likely to leave an unsightly scar.

Because the collagen fibers in skin line up in the direction of tension, a surgical cut made along these so-called Langer's lines severs fewerfibers and is less likely to leave an unsightly scar.