***在《湖南农民运动考察报告》里指出，反封建闹革命就是要反对四权（神权、政权、族权、夫权），下列哪一制度体现了明显的族权

单项式 $-\frac{a{b}^2{c}^4}{3}$ 的系数是____，次数是____

阅读下面文言语段，完成后面题目。
                                                                                         【甲】
        至若春和景明，波澜不惊，上下天光，一碧万顷；沙鸥翔集，锦鳞游泳；岸芷汀兰，郁郁青青。而或长烟一空，皓月千里，浮光跃金，静影沉璧，渔歌互答，此乐何极!登斯楼也，则有心旷神怡，宠辱偕忘，把酒临风，其喜洋洋者矣。        ——节选自范仲淹《岳阳楼记》
                                                                                          【乙】
        盖余以八月之望过洞庭，天无纤云，月白如昼。沙当洞庭青草之中，其高十仞，四环之水，近者犹数百里。余系船其下，尽却童隶而登焉。沙之色正黄，与月相夺；水如玉盘，沙如金积；光采激射，体寒目眩。阆风、瑶台、广寒之宫，虽未尝身至其地，当亦如是而止耳。盖中秋之月，临水之观，独往而远人，于是为备。书以为金沙堆观月记。                                                                      ——选自张孝祥《观月》

自然界存在着____种电荷．a、b、c、d四个带电体，a与b互相排斥，b与c互相吸引，c与d互相排斥，d与用毛皮摩擦过的橡胶棒互相吸引，则a带____电．

请认真阅读下列短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项。
A
    If you travel by air across the center of Africa or South America, you fly over forests for thousands of kilometers. These great forests are the oceans of trees. There are full of thousands and thousands of different kinds of plants and animals.
    However, the world's forests are getting smaller all the time. We are cutting down the trees because we need wood, and we need more farm land. Some people say that there will not be any forests like these in 20 or 30 years. what will happen if they disappear?
    If we cut down our forests, a lot of plants and animals will disappear from the world. In a lot of places the new farm land will soon look like the old deserts. Crops will not grow there. It will not rain very often, and the weather will get very hot. Perhaps the climate of the world will change. This will be dangerous for everyone in the world. That is why we must take care of our forests.