Exercise 1: Read the following paragraphs and underline the topic sentence and mark out the sentences that do not support the topic sentence in the paragraph. (标出主题句,把不相关的句子划去) Paragraph 1 The world has enjoyed many benefits from the invention of the telephone. First of all, it has brought convenience to families and friends. For example, people can contact each family member or friend who lives far away through the telephone. Many people do not like writing letters to each other. Besides, the telephone shortens the distance between oceans and continents as people living in different continents can talk over the telephone. In addition, the telephone has also contributed greatly to efficient communication in the world business. And nowadays, the Internet brings us more convenience. Paragraph 2 I had a terrible morning today. I didn’t get enough sleep last night. I tripped over a curb on my way to my political science class and tore my raincoat. In the middle of a class, I discovered I had left my physics assignment in my locker. At the end of the class, the professor would not let me go to lunch on time. I had not turned in my assignment, and he wanted to talk it over with me. The professor was always strict with his students and I was always afraid of him. I heard that he was also very strict with his own children.