如果站在美洲土著人立场上对哥伦布和发现美洲新大陆进行评价，其观点最有可能是（     ）

如果一扇形的弧长为2πcm，半径等于2cm，则扇形所对圆心角为____ 

阅读下面这首古诗，回答相关问题。
                                                                                                  浣 溪 沙
                                                                                                   欧阳修
                                                                     堤上游人逐画船，拍堤春水四垂天。绿杨楼外     秋千。
                                                                    白发戴花君莫笑，六幺催拍盏频传。人生何处似樽前。
     【注】欧阳修早年被贬颍州，晚年又隐居于此，州城西北，有一天然水泊，人称西湖，风景优美，是当时的名胜之地。欧阳修常来此游览。六幺，为唐代琵琶曲名。

      There is an old Chinese saying, “If someone gives you a little drop of water, you should return a spring of water." That means if someone helps you a bit, you should remember it and thank them gratefully(感激的）in return.

       We should live in a world of gratitude. We should prove it with actions, not just words. We thank people who hurt us, because they teach us important things. We thank people who give us up, because we learn how to be independent. We thank people who selfish(自私的）, because we learn the importance of being kind. Of course, we should thank people who help us. We should thank people who teach us. We should thank people who care about us.

      We thank our parents. They work hard all the time in order to give their sons and daughters a better life. They cook meals for us, they do the chores for us, they always give us food and clothes, they teach us what is right and what is wrong.

      We thank our teachers who give us dreams. They teach us a lot of things but they ask for nothing from us. We are well-educated of them.

     There are a lot of people that we should be grateful to in our life. We should find a way to thank them.

一艘小型油轮从波斯湾启航，取捷径驶往欧洲西部，需经过（　　）