题目

细胞在代谢过程中，会产生过氧化氢，它对细胞有毒害作用，但体内有过氧化氢酶的存在可以将其分解为水和氧气，其催化活性可用如下方法测定：用打孔器将滤绕制成小圆片，浸泡在含酶的过氧化氢缓冲液中，实验开始时，小圆片沉降在溶液的底部，但后来会浮出液面，记录小圆片上浮的时间，用时间的倒数来表示过氧化氢的催化活性。为研究反应物浓度对酶催化活性的影响，实验在不同浓度的过氧化氢溶液中重复进行，实验结果如图所示，分析并   A new generation addiction is quickly spreading all over the world. Weboholism, a twentieth century disease, affects people from different ages. They surf the net, use e-mail and speak in chat rooms. They spend many hours on the computer, and it becomes a compulsive habit. They cannot stop, and it affects their lives.     Ten years ago, no one thought that using computers could become compulsive behavior that could affect the social and physical life of computer users. This obsessional behavior has affected teenagers and college students. They are likely to log on computers and spend long hours at different websites.     They become hooked on computers and gradually their social and school life is affected by this situation. They spend all free time surfing and don’t concentrate on homework, so this addiction influences their grades and success at school. Because they can find everything on the websites, they hang out there. Moreover, this addiction to websites influences their social life.     They spend more time in front of computers than with their friends. The relation with their friends changes. The virtual life becomes more important than their real life. They have a new language that they speak in the chat rooms and it causes cultural changes in society.     Because of the change in their behavior, they begin to isolate themselves from the society and live with their virtual friends. They share their emotions and feelings with friends who they have never met in their life. Although they feel confident on the computer, they are not confident with real live friends they have known all their life. It is a problem for the future. This addictive behavior is beginning to affect all the world. 1.The author’s attitude towards weboholism is that of being______.    A. optimistic        B. positive      C. oppositive     D. acceptable、 2.The main idea of the passage is about__________.    A. the cause of weboholism           B. the advantage of weboholism    C. the popularity of weboholism      D. the influence of weboholism 3. The underlined word “obsessional” in the second paragraph most probably means “________”.    A. attractive                        B. addictive    C. professional                      D. potential 4.We can infer from the passage that_______.    A. weboholism has the greatest effect on teenagers    B. students can hardly balance real and virtual life    C. people are addicted to games on the Internet    D. virtual life is more vivid and attractive anyway 5. Which of the following is NOT true of weboholism?    A. It contributes to the development of the web.    B. The chat room language may change social culture.    C. The problem will be getting more and more serious later.    D. People addicted to the web often become inactive in real life.