下图是甲、乙、丙三地房屋冬、夏至阳光照射情况，图中都画出了当地冬至和夏至两个节气的阳光，分别用A或B表示。则下列判断正确的是（    ）

根据短文理解，选择正确答案。

    Some people love going to museums，while others absolutely hate it and would rather stay at home，enjoying their favorite TV shows．Increasingly，museums are being seen as outdated and boring by today's youngsters．I have just returned to the UK after travelling around the USA． While there，I visited lots of museums  I must say，museums are typically educational, either to develop knowledge gained at school in particular subjects，or to enhance knowledge of other cultures

    In Chicago，we visited the world-famous Art Institute of Chicago．It was filled with paintings，drawings and sculptures by a huge variety of artists，such as Picasso，Monet，Matisse and Dali．

    There was a mixture of traditional and modern art，including colorful stained glass windows and abstract art．

    When we were in Washington D． C． ，we visited a few of the Smithsonian museums．These are all free to visit-which is great if you just want to see a few things，and not spend all day inside．

    The Air and Space Museum was particularly good：it had lots of aircrafts and rockets on display，interesting information and also some interactive parts．We also went to the National U．S．Holocaust（纳粹大屠杀）Memorial Museum．Naturally，it was sad to read about the horrors of this tragedy which affected so many people in World War II．However，it was also incredibly interesting to read the stories of those who survived the Holocaust，as well as those who helped others．

    Last but not least，I also found the 9/11 Memorial and Museum to be of great interest．This museum is dedicated to those who lost their lives，as well as their families，when the Twin Towers in New York City were attacked by terrorists in 2001It tells you how the terrorists planned the attack，how they hijacked the planes，and ultimately what happened as a result of their actions．Surviving pieces of the towers are shown in the museum，alongside damaged fire engines．It was a truly thought-provoking visit，which made me value my own life that little bit more．

    I think museums play an important role in preserving artifacts of historical importance for future generations．Whatever your interests，there is likely to be a museum for you．You can visit waxwork museums to see models of your favorite celebrities（and get photos with the Queen！），science museums for a more hands-on，interactive visit and so much more！Best of all，if you're ever in the UK，many of them are free！

阅读下面的文章，完成后面题目。

iPhone的魅力

        ①2011年苹果公司第三季度的报表显示，该公司持有流动资金758亿美元，超过美国政府的730亿，做到了真正的“富可敌国”。

        ②自从苹果公司首席执行官史蒂夫•乔布斯在2007年1月9日宣布推出iPhone系列手机之后，iPhone的四款产品目前占全球手机市场份额的5．6%，却赚得全球手机市场利润总额的近三分之二。如此强大的吸金能力着实令人敬佩。在中国，价格4900元左右的iPhone4在手机市场出现断货的情况已不少见；在美国，有一半的美国人在选择智能手机时会倾向于iPhone；在英国，甚至有一位男子为了买到最新一代iPhone而提前一个多月在苹果零售店门口搭帐篷排队。

        ③iPhone席卷全球的势头已经无法阻挡，那到底是什么因素让它拥有如此强的吸引力呢？

        ④iPhone有个杀手锏，叫App Store。简单地说，它就是一个内置于iPhone的下载软件的程序。你只需轻轻点击就可以在App Store下载你所喜爱的程序，有些软件需要付费，但付费方式极为简单：你只需将App Store与你的银行卡绑定，即可实现轻松下载。凭借着如此便捷的软件下载方式和App Store中高质量的软件，让iPhone一下子成为了全球最受欢迎的智能手机。软件开发者们可以为iPhone研发软件，再提交苹果审核后最终放到App Store上供用户下载，如果下载收费，利润由苹果与应用开发商3：7分成。这不仅让那些优秀的软件开发商们赚得盆满钵满，更使得苹果公司从中赢取相当大的一笔收入。

        ⑤这种全新的商业模式，一举做活了企业。其他手机厂商以及手机系统开发商也开始争相模仿，希望从中分一杯羹。但目前的App Store仍凭借着42．5万应用和逾150亿次的下载数稳坐软件销售平台中的超级霸主。

        ⑥当然，iPhone看起来似乎异常强大，无懈可击，但其实它也并不完美，甚至有不少弱点。在国人看来，iPhone的费流量问题就一直很难解决。其实这个问题一定程度上也是因为许多买家不善用iPhone导致的。比如：不了解iPhone的许多程序会自动联网获取信息；不习惯随手关闭不用的程序和蜂窝数据，导致后台持续运行而费流量费电。iPhone的致命短处是用户不能自行更换电池。一旦电池出现故障，必须送至苹果零售店去维修，而且维修价格也着实不菲。此外，iPhone传输文件不像Windows熟悉方便，蓝牙也不能传输资料。这些缺点和问题让iPhone仍有提升的空间。

        ⑦iPhone以它创新的技术和经营模式引领着手机的潮流，时尚的方向。让我们期待未来更加完美的iPhone吧。

      【注释】iPhone是由苹果公司所推出的一款支持电邮、移动通话、短信、网络浏览以及其他无线通信服务的手机，于2007年在美国上市。

                                                                                                                                                                              （选自《信息化建设》2011年第9期，有删改）

请欣赏《长征组歌》——《遵义会议放光辉》:苗岭秀，旭日升，百鸟啼，报新春。遵义会议放光辉，全党全军齐欢庆。万众欢呼毛主席，马列路线指航程。雄师刀坝告大捷，工农踊跃当红军。英明领袖来掌舵，革命磅礴向前进。
并结合所学回答问题。

地理信息系统的主要功能是（    ）。