【答案解析】文章首段就说“It is pretty much a one—way street.While it may be common for university researchers to try their luck in the commercial world,there is very little traffic in the opposite direction.”高校研究者到商界去碰运气可能很常见,但是相反的方向却人很少。也就是说很少有商界的人愿意回归学校做纯学术研究。故答案为C。