2015年9月3日，***主席在纪念中国人民抗日战争暨世界反法西斯战争胜利70周年阅兵讲话中高呼“人民必胜”！面对野蛮残暴的日本侵略者，中国人民经历8年艰苦卓绝的浴血奋战，最终赢得了中国人民抗日战争伟大胜利，也为世界反法西斯战争作出了重大贡献。这反映出人民群众（    ）

①是社会变革的主力军   ②自己解放自己，是社会存在和发展的基础

③是社会历史的主体，是社会变革的决定力量

④是社会历史的创造者，决定社会历史的性质

生物体都能适应各种环境并影响环境．

    The summer holiday is coming. I am going to do my homework every day. I am going to play ping­pong and basketball with my friends. I am going to go to the park with my friends, surf the Internet(上网), read books and watch TV every evening. I am going to visit my grandparents and help them with the housework. I am going to help my parents clean the room and cook dinner. I love summer holidays!

I am going to____ 

⑴do my homework

⑵watch a film

⑶visit my uncle

⑷go to the park

⑸do the housework

⑹go shopping

⑺clean the room

⑻cook dinner

①NH₂+CO₂+X=NH₄HCO₃

②NH₄HCO₃+NaCl=NH₄Cl+NaHCO₃↓

③2NaHCO₃ $\underset{\_}{\underset{\_}{\Delta }}$ Na₂CO₃+H₂O+CO₂↑

请回答下列问题：