题目内容
s = "abcd1234", find()函数可以在字符串中搜索子串 ,s.find("cd") 返回的结果是________。
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1. Many stories tell us that some every good students lost their university scholarships due to their low grades, or that other students didn't graduate from university merely because they spent too much time online.2. The Internet offers a good way to keep in contact with our friends. It gives us a great variety of media choices and offers different news sources with different perspectives.3. So keep an eye on how much time you spend online; limiting and controlling your time online can protect you from developing Internet addiction.4. Internet addicts behave just like people who gamble at the gambling machines in Las Vegas, even if it is not reasonable, even if it affects their studies, or even if it ruins their health and their lives.5. Cars bring us convenience, but they also cause pollution and traffic jams. Similarly, it has been proven that the widely used Internet has caused a new kind of social problem – Internet addiction.6. Another recent news story was about a man who spent so much time on the Internet that he didn't get enough sleep and lost his job.7. Without the parents monitoring and regulating them as they used to do at home, students have to arrange their online time on their own.8. Some people are not influenced by the strong attraction of the Internet because they can easily control their time online. So, it is easy for them to consider Internet addiction as an unreal problem or to think that a weak character is the root of Internet addiction.9. It is not surprising that Internet communication activities can cause the release of endorphins as these activities often involve solving a difficult problem or having social exchanges.10. The Internet has become something that people must have and must know how to make good use of in order to succeed in the modern world.
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