题目

化学二课堂活动中，某兴趣小组做了如下实验，请回答以下问题． （1） 图A所示的实验，当通过导管向热水中通入氧气时，白磷在水下燃烧，该实验说明燃烧需要的条件为：①可燃物；②，③达到可燃物的着火点；反应的化学方程式为，在该反应中，每份质量的白磷和份质量的氧气恰好完全反应生成份质量的五氧化二磷． （2） 图B所示实验可观察到“铁树”上浸有无色酚酞试液的棉团由白色变为色，该实验中涉及的性质是（填字母）． Four American college students learned last week that free music downloads can carry a hidden price tag(标价) --- US $ 12,000 to $ 17,500, to be exact. Major record companies accused the students of fueling music piracy(盗版) by running file-sharing networks on campus allowing hundreds of songs to be downloaded for free. Last Thursday, the four promised not to violate（侵犯）the companies’ copyrights. Although they did not admit any wrongdoing, they each agreed to pay thousands of dollars to the Recording Industry Association of America (RIAA). “I don’t believe that I did anything wrong,” said Daniel Peng at Princeton University, one of the four. “I hope that for the sake of artists, the larger issues can soon be resolved.  ” None appears to have made any money off the file-sharing systems they operated.   The payments mark the first time record companies have recovered money from individuals in the US accused of piracy on file-sharing networks. This may be a sign of things to come, as the industry starts taking its battle against online piracy directly to users. Many record-company blame the long decrease in CD sales on file-sharing networks, which let many users copy songs from each other’s computers for free. Matt Oppenheim, senior vice president of business and legal affairs for the RIAA, said the settlements, although well below what the companies could have asked for, were “the right amount” given the situation. He also noted that since the four lawsuits were filed, at least 18 campus file-sharing networks have been taken down by their operators. 1．What does “a hidden price tag” (Paragraph 1) mean?      A．Record companies hide the high price of the music on purpose.      B．It happens that the music price tag isn’t obvious.      C．One has to fined for illegal music downloads.      D．One has to pay for the music he downloads. 2．Which of the following is true?      A．The four students planned to violate the company’s copyright.      B．They realized they had done a wrong thing.      C．They refused to pay money to RIAA．      D．They didn’t make any money on file-sharing networks. 3．What’s the probable meaning of “fuel” （Paragraph 2）?      A．encourage.     B．challenge.           C．weaken.          D．sell 4．What can we conclude from paragraph 6?      A．Many record-company should be blamed for the decrease in CD sales.      B．Decease in CD sales is caused because of certain file-sharing networks.      C．People don’t have any desire to buy any CD．      D．Nowadays CDs are not as popular as before. 5．What’s the main idea of the whole passage?      A．The students should be responsible for their behavior.      B．It’s too late for record companies to protect their rights.      C．Action had been taken by record companies to protect their copyrights.   D．Some record companies wanted to earn money by accusing people of pirating music．