Test analysis: This question examines students' ability to recognize typos. There are typos and other words. A typo is not a word, and another word is a typo. The main reason for the appearance of other words is the confusion of homophones and variants, which need to be accumulated at ordinary times. At the same time, scribbling is also a factor that causes typos. Therefore, we should develop a rigorous and serious writing habit. A. Hanging the schoolbag should be "dropping the schoolbag"; B. The old couple should be "old couple"; D. to use loyalty, loyalty should be "emotional."