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近一段时间以来，网络上开始热炒有关健身对健康问题的影响。有专家认为：适度的健身，是保持身体健康的重要原因，而过量的健身，不可避免地会对身体造成损害。 以下各项是该专家想要表达的基本含义，除了哪项
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Among the most popular books being written today are those which are usually classified as science fiction. Hundreds of titles are published every year and are read by all kinds of people. Furthermore, some of the most successful films in recent years have been based on science fiction stories.It is often thought that science fiction is a fairly new development in literature, but it can be found in books written hundreds of years ago. These books were often concerned with the presentation of some form of ideal society, a theme which is still often found in modern stories.Most of the classics of science fiction, however, have been written within the last hundred years. Books by writers such as Jules Verne and H.G. Wells, to mention just two well-known authors, have been translated into many languages. Modern science fiction writers don"t write about men from Mars or space adventure stories. They are more interested in predicting the results of technical developments on society and the human mind; or in imagining future world which are a reflection of the world which we live in now. Because of this their writing has obviously political undertones.In an age where science fact frequentlyovertakesscience fiction, the writers may find it difficult to keep ahead of scientific advances. Those who are sufficiently clear-sighted to see the way we are going, however, may provide a valuable lesson on how to deal with the problems which society will inevitably face as it tries to master its new technology. In the past, science fiction was probably concerned with ______.
"I sometimes get up at three or four in the morning and I surf the net.""I often check my e-mail forty times a day.""I often spend more than three hours during one time on the net.""I spend more time in chat rooms than with my "real-life" friends."Do you know any people like these They are part of a new addiction (瘾) called Internet addiction. Internet addicts spend at least thirty to forty hours online every week. The use of the Internet can be an addiction like drug use. People lose control of the time they spend on the Internet.For example, one college student was missing for several days. His friends were worried, and they called the police. The police found the student in the computer lab: he was surfing the net for several days straight.Studies show that about 6 to 10% of Internet users become addicted. And people worry about the teens because the Internet is changing the playing field for some of them. They spend more time in cyberspace than in the real world of friends and family.Is "surfing the net" a hobby or an addiction for you You may have a problem if you have these symptoms (症状):●You do not go to important family activities or you do not do school work because you like to spend hours on the Internet.●You can"t wait for your next online time.●You plan to spend a short time online, but then you spend several hours.●You go out with your friends less and less. What does the beginning of the passage tell us
Morphemes that represent "tense", "number", "gender", "case" and so forth are called ______ morphemes.
—Jack, I want to change my job. You know I haven"t achieved anything since I took up teaching. —Really There is not a job considered the best one! As we all know, ______!
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