题目

在鉴定还原糖的实验中，加入斐林试剂时必须要： A．先加入斐林试剂甲液，后加入乙液 B．先加入斐林试剂乙液，后加入甲液 C．将斐林试剂的甲液和乙液混合均匀后再加 D．以上A、B、C三项操作方法都正确 答案：C假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下短文。短文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。删除：把多余的词用斜线（\）划掉。修改：在错的词下划一横线，并在该词下面写出修改后的词。注意：1. 每处错误及其修改均仅限一词；2. 只允许修改10处，多者（从第11处起）不计分。This afternoon we had our PE lesson. The teacher had taught us how to practise high jump. The bell rang and we went to the playground on line. After warming-up exercises, the teacher told me the way of jumping and then gave us an example. Followed the teacher one after another, my classmate did very well. Soon it was my turn and I felt a little nervously. I failed at my first attempt, but I was not a bit discouraging. I kept on thinking about the teacher’s words and practising. I managed jump over the pole in the end. From this class I have realized one can succeed whether he has perseverance, just as the old saying go, “Where there is a will, there is a way.”