题目

端午节期间，某食品店平均每天可卖出300只粽子，卖出1只粽子的利润是1元．经调查发现，零售单价每降0.1元，每天可多卖出100只粽子．为了使每天获取的利润更多，该店决定把零售单价下降m(0＜m＜1)元． (1)零售单价下降m元后，该店平均每天可卖出______只粽子，利润为______元． (2)在不考虑其他因素的条件下，当m定为多少时，才能使该店每天获取的利润是420元并且卖出的粽子更多？6、In today’s Internet age, the demand for online games continues to grow. Online computer game centers exist in many cities and towns throughout Asia. Facing the pressures of school and life, people turn to the virtual（虚拟） world, expecting a diversion from these problems. Too often, however, they can lead to problems and unhealthy addictions.    This is most clearly seen in the example of South Korea. The country has the world’s highest percentage of high-speed Internet services. It also has a high number of online game players and related problems. In 2002, a young man collapsed（突然晕倒） and died while playing online games. He had been playing almost nonstop for 86 hours at an Internet café. Another young man killed his sister after becoming confused between the online world and real life. A 12-year-old boy stole US $ 16,000 from his father and ran away from home. He did this to continue his obsession（着迷） with an online game. Such problems, however, don’t just happen in South Korea. They are spreading to other parts of Asia, as well.    What kinds of people develop online game addiction? What does the problem look like? Dr. SueHuei Chen, a clinical psychologist, researches Internet addiction. She discovered some signs of at-risk individuals such as lack friendships and good social skills. Those problem individuals feel it so compulsive（极有趣的） to play online games that they could sacrifice（牺牲） things such as school or family. They feel the need to spend more and more time online. And they become upset if anyone tries to limit their online game playing.    How many problem game players are there? In mainland China, the potential number of problem online gamers is alarming. In 2004, the China Daily reported that China had 13.8 million online game players. Furthermore, it stated that 80 percent of these were under 25 and had signs of addiction. Such numbers point toward a growing problem among Chinese youth.    Make sure to keep control over your online game playing. If you don’t control it, it can get control of you. 1．What is mainly discussed in the passage?      A．The disadvantages of the Internet．     B．The online game problems in Asia.      C．The popularity of online games worldwide．     D．The cause of online game addiction. 2．The underlined word “diversion” in the first paragraph is closest in meaning to __________.      A．career                 B．comfort               C．escape                D．support 3．According to Paragraph 2, which of the following statements is NOT true?      A．Online violence is blamed for the young killer’s wrong action.      B．Online game playing is responsible for the young man’s death.      C．People in South Korea have access to the Internet most easily.      D．The teenage boy stole money due to his playing games online. 4．What can we learn from the passage?   A．Most people in Asia have developed an addiction to online games.   B．Online game addictions cause many life-and-death problems in South Korea.   C．Lonely and unsocial people seem to more easily develop Internet addictions.       D．In the year 2004 there were a total of 13.8 million Chinese visiting the Internet.