善良要付诸行动，表现在（   ）
①对需要帮助的人给予力所能及的帮助②关怀和体贴别人，为别人的需要作出贡献
③体验生命的快乐                           ④为了得到某种回报，去做一些看上去善良的事

若$x{\log }_{2}3=1$，则^{$3^x+9^x$}的值为（     ）

Dear friends,
   My name is Helen. I'm 12 years old. I  1  from Taxas, America. I’m really  2   in Chinese geography. It's fun! And I hope you can tell me more. I like hamburgers best,  3   I try to eat them twice a week  4   it's a kind of   5   food. And I like to drink lemon  6   . As for sports, I often go swimming with my parents on weekends.
   I   7  in Cobb Street School. My   8  subjects in school are ME and art. They are really fun! After school, I like to go to the   9   with my family or friends. I like action movies and cartoons. They’re  10   How about you? Do you often go to the cinema with your family or friends?
                                                                                                                                                                   Yours,
                                                                                                                                                                   Helen

有学者在评论中国某一制度时说，它“导致……获取官职的机会对任何人开放，只要他们能证明自己有足够的学养”，并可以“培植全国人民对政治之兴味”。这一制度是指（  ）