（钻石）____ .
某尿素【CO（NH2）2】化肥样品（杂质中不含氮元素）中含氮元素为43%，则此尿素化肥样品的纯度为（ ）
如图表示天竺葵个体发育不同时期结构层次，据图回答下列问题：
— Leonardo didn't win an Oscar __________ he acted in The Revenant《荒野猎人》.
— Yeah. It was hard for him to realize this dream, but he never gave up.
