题目

阅读下面短文，掌握大意，从各题所给的四个选项A，B，C，D，中选出最佳选项。Eventhough it was only October, my students were already talking about Christmasplans. With each passing day, everyone became more 1, waiting for the final school bell. As soon as the bell 2, everyone would run out of school and go home, everyone exceptDavid.David wasa small boy in ragged (破烂的) clothes. I had often 3 what kind of home lifeDavid had, and what kind of mother could send her son to school dressed so 4 for the cold winter months,without a coat, boots, or gloves. But somet（5分）在宏观、微观和符号之间建立联系是化学学科的特点。（1）从深海鱼油中提取出来的一种不饱和脂肪酸被称为“脑黄金”，它的化学式为C26H40O2，它由      种元素组成，其中氢元素与氧元素的质量比为         。（2）自来水消毒过程中通常会发生如下反应，其反应的微观过程可用下图表示：请回答以下问题：① 以上物质中属于氧化物的是        （填序号）。②乙图所示化学反应中，若生成64gE物质，需要D物质的质量为____g。