演员黄渤发布微博称:“那日帕劳潜水,正为上帝的奇作美景唏嘘不已,突看见水面漂浮一烟盒,心中暗骂哪来的无德之人,这么干净的水怎丢的下手!突然看见烟盒上两个大字‘××’(配图为中华牌香烟)! 臊得我上去一把捏在手里,像做贼一样生怕被别人看见、一直带回岸边。朋友啊,去别人家做客咱客气点,这俩字的脸丢不起啊!”这说明公民应履行的政治性义务是（  ）

各大洲中，人口自然增长率最高和最低的大洲分别是                (     )

老鼠和大象的体积相差很大，主要是因为的结果（  ）

阅读下列文字，回答文后问题。
                                                                                              嫉妒的山丘
                                                                                          ［法国］雨果
                                                                            嫉妒的山丘有一天对阿特拉斯山说：
                                                                         “你看我们的芳草地，你看我们绿油油的牧场，
                                                                            少女前来自由散步，
                                                                            唱歌，欢笑，唱过以后遐想；
                                                                            你看我们的脚，海浪吻着几乎不带吼声，
                                                                            野蛮的海洋！你看我们额头的明净，
                                                                            炎热的夏天和眼珠似的露水，
                                                                            使它戴上花冠，光彩照人！
                                                                          “但是你，巨人——究竟怎么回事，在你秃顶上，
                                                                            长着褐色眼睛的鹰不断翱翔？
                                                                            究竟是谁，像是鸟在上面筑巢的树枝，
                                                                            使你的宽肩和铁背弯成这样？
                                                                            为什么在你黑黝黝的肋部有如许黑黢黢的深渊？
                                                                            究竟是什么永恒的暴风打击你，以阴沉的电光？
                                                                            究竟是谁在你头额上放下如许的皱纹、如许的雪？
                                                                            从没有露出春天微笑的脸，
                                                                            究竟是谁把它完成这样？
                                                                            而且把它泡在什么汗水里边？……”
                                                                            阿特拉斯回答说：“那是因为我背负着一个世界。”
                                                                                                             （注：阿特拉斯是希腊神话中顶住天的巨神。）