在论及元杂剧时，明朝有王骥德感叹：“(文人的贫穷)由天地开辟以来，……俟夷狄立中华，于是诸词人一时林立。”此话反映了元代杂剧兴盛的原因是(　　)

数一数，有多少个长方形，有多少个正方形。

____ 个长方形，____个正方形。

某校学生会向全校学生发出倡议：“不要问父母和长辈能为自己做些什么，但要问自己对父母和长辈做了些什么；不要问别人能为自己做些什么，但要问自己能为别人做些什么；不要问社会与国家为我们做了什么，但要问自己为社会与国家做了些什么。”该倡议体现了
①有价值的人生不考虑个人利益
②人生价值是在个人与他人、社会之间的关系中实现的
③实现人生价值需要正确的价值观的指引
④实现人生价值需要一定的客观条件

阅读下面短文，从短文后各题所给四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。

    Li Qinmei lives in Zhucheng, Shandong Province. She lost her 1 at three. Four years later, her father couldn't 2 after an accident. After the death of her grandmother, 12-year-old Li Qinmei had to support her broken family.

    Qinmei learnt to 3 and live a life with 24 yuan per month from the government. The most 4 things she had to deal with were to 5 her father wash, dress and use the toilet as he could hardly move.

    During most of her junior school years, she went to classes 6 once a month as her father was seriously ill at that time. “I taught 7 at home and asked teachers for help on my school days,” she said.

    Though she had a hard life, the difficulties taught her to be 8. “My classmates have both Mum and Dad to 9 them. How happy they are! However, I don't feel 10 as I still have my dear dad and many kind people with me. I believe I will go to college,” she said.

抗体的化学本质是（    ）