题目

Yuan Longping spent his whole life doing research into rice and his a________ will be remembered by us all forever. 答案：(a)chievement/(a)chievements【详解】 句意：袁隆平毕生从事水稻研究，他的研究成果将被我们永远铭记。根据空前的 his可知，此处缺一个名词； achievement 成就，可数名词，此处用单数和复数形式均可。故填 (a)chievement/(a)chievements 。 9400毫升＝________升＝________立方分米