题目

阅读下列材料，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题纸上将该选项标号涂黑。AFrom the very beginning of school we make books and reading a constant source of possible failure and public humiliation. When children are little we make them read aloud, before the teacher and other children, so that we can be sure they “know” all the words they are reading. This means that when they don’t know a word, they are going to make a mistake, right in front of everyone. After having taught fifth-grade classes for four years, I decided 下面是小华同学从“错题集”摘抄的部分内容，其中需加以改正的是（　　）A、铁锈可用稀盐酸清洗掉B、分别点燃一小块棉纤维和羊毛纤维，都产生了烧焦羽毛的气味C、氮气的化学性质不活泼，可用于食品防腐D、体温计中的水银属于金属材料