题目

根据下列句子及所给汉语注释,在答题卷上写出空缺处各单词的正确形式,每空只写一词。 1.It’s not right to____ (争吵)with your classmates. 2. If you take more ______(锻炼), you will be much healthier than before. 3. Sorry, sir, I __________ (忘记) my English book at home 4. They _____(唱)and danced for the whole afternoon. 5. Mr. Zhang is going to give us a talk______(亲自) 6. I’m ill. I only would like to drink some water. I don’t feel like _________ (吃) anything.某材料只含金属镁和铝，课外小组为测定该材料中Mg的含量做了如下实验：取102g材料完全溶于盐酸得到溶液，将溶液分成两等份，向其中一份中逐渐加入NaOH固体，NaOH固体与溶液中产生沉淀的质量关系如图所示，则该材料中Mg的质量分数为( ) 已知:  A.23.53% B.42.65% C.21.32% D.47.06%