题目

  A young man, while traveling through a desert, came across a spring of clear water.    1___water was sweet. He filled his leather container so that he could bring some back to an elder  2 __  had been his teacher. After a four-day journey, the young man   3    ( present ) the water to the old man. His teacher took a deep drink, smiled   4   ( warm ), and thanked his student very much for the sweet water. The young man went home   5   a happy heart.      After the student left, the teacher let   6   student taste the water. He spit it out,    __7___(say水稻在我国有着源远流长的种植史，下列哪个地方的先民最早可以品尝香喷喷的米饭A.浙江河姆渡B.陕西半坡村C.北京周口店D.云南元谋县