填入下面一段文字横线处的语句，最恰当的一句是（   ）

    创业创新是人类文明进步的不熄引擎，是植根于每个人心中具有顽强生命力的“种子”。推动发展，________，________。我国是世界上人口最多的国家，13亿勤劳智慧的中国人民中间，蕴藏着无穷的创造力。试想一下，如果13亿人的创新创造潜能充分释放出来，那将给经济社会发展带来什么样的变化。

《九章算术》“竹九节”问题：现有一根9节的竹子，自上而下各节的容积成等差数列，上面4节的容积共为3升，下面3节的容积共4升，则第5节的容积为____升．

对于1660年英国发生的事件，有人认为：这不是倒退，只是一种形式上的妥协，实质上的维护而已。下列事件能证明上述观点的是(  )

①查理二世凭借强大实力卷土重来 ②使政权回到原统治者手中 ③使英国社会性质发生变化 ④复辟王朝是一种变相的资产阶级政权

CuI是一种不溶于水的白色固体，它可由反应：2Cu^2＋＋4I^－=2CuI↓＋I₂而得到。现用铜片、石墨作电极，电解KI溶液制取CuI。为确认反应情况，通电前在溶液中又加入了少量的酚酞试液和淀粉溶液。电解一段时间后得到白色沉淀，同时阴极区溶液变红，阳极区溶液变蓝。下列说法正确的是      (　   )
①铜片做阴极，石墨做阳极            ②铜片做阳极，石墨做阴极
③阳极有氧气生成                    ④阴极有氢气生成
⑤白色沉淀在阳极附近生成            ⑥白色沉淀在阴极附近生成
⑦阳极区溶液变蓝的原因是2Cu＋4I^――4e^－=2CuI↓＋I₂碘遇淀粉变蓝
⑧阳极区溶液变蓝的原因是4OH^――4e^―=2H₂O＋O₂↑，O₂将I^－氧化为I₂，碘遇淀粉变蓝

阅读理解

D

    He Jiang, a postgraduate（研究生）in biology. will become the first Chinese student to give a speech in the commencement(毕业典礼)at Harvard University on May 26, 2016.

    Given the highest honor by the university, He Jiang, who was born in a small village in Hunan province, said, "People in China often believe that it's useless to study and children from the countryside cannot be successful in the future. However, I cannot agree with them. Education can change a person's life. I hope my experience can encourage the students from the countryside to spare no effort in study and make their dreams come true."

    Different from many other families in the village, his parents never thought about finding a job in big cities and leaving their two sons at home without their care. His father was strict about their studies. He and his younger brother studied at home while the other kids in the village played in the fields. Unlike his strict father, his mother took her sons' side when her husband scolded the boys. She preferred to sit with her sons when they studied rather than chat with other women in the village.

    Getting the chance to speak at the commencement is no accident. During his first days in Harvard, it was quite difficult for him to follow the professors in class and he was speechless in campus because of his poor English. Instead of giving up, He Jiang spent all his free time on English. He also made friends with natives to improve his speaking English. One year later, he had little difficulty in class and soon became one of the top students in his class. With the encouragement from Professor Diana Eck. He Jiang decided to apply(申请）for the chance to speak at the commencement.“Few Chinese students had applied before, but I wanted to have a try. I just want to realize my idea of letting more people hear the voice from China and telling them that China is not what it used to be." said He Jiang. After beating three students from Harvard Kennedy School in the third and final round, He Jiang made it to get the chance to speak at the commencement.

    He Jiang will go to Massachusetts Institute of Technology after graduating from Harvard.