阅读下面短文。从短文后所给的A、B、C三个选项中选出最佳选项。

    Light travels at a very fast speed. It is about a million times 1 than the speed of sound. You can get some idea of this 2 by watching the start of a race (赛跑). If you stand some distance away from the starter, you can see smoke from his gun before the sound gets to your 3

    This great speed of light4some strange facts. Sunlight 5about 8 minutes to get to us. If you look at the light of the moon tonight, 6 that the light rays (光线) left the moon 1.3 seconds before they got to you. The nearest star is so 7 away that the light which you can see from it tonight started to 8 towards you several years ago. In some cases, the light from one of tonight's stars had started on its journey to you before you were born.

    So, to be exact, we can't say, "The stars are shinning 9." We have to say instead, "The stars 10 pretty. They were shining several years ago, but their light has only just got to the Earth."

用足量的CO还原4.0g某种铁的氧化物，生成的气体全部被足量的澄清石灰水吸收，得到沉淀7.5g，则这种铁的氧化物可能是（　　）

阅读下列材料：
材料一、我相信我们的政府不能永远忍受一半奴役一半自由的状况。我不期望联邦解散，我不期望房子崩溃，但我却期望它停止分裂。 ——林肯的一次演说
材料二、列宁说：“农民获得‘自由’的时侯，已经被剥夺得一干二净。”
材料三、废藩置县；引进西方枝术，置产兴业，鼓励发展近代工业。1870年设工部省，聘请大批外国专家和枝师，引进先进没备和管理方法……；提倡文明开化，实行强制性义务教育；模仿西方国家，实行征兵制，建立常备军．
请回答：（1）材料一中“一半奴役一半自由”指的是什么?(2分)材料反映了林肯什么样的态度？
（2）材料二、三反映的相关历史事件在土地问题上分别有哪些规定？ 在近代中国与这两个事件性质相同的改革是什么？
（3）根据材料三，写出最能体现该事件性质的措施。 （不得完全照抄材料）
（4）材料三中相关措施对我国现代化建设有何启示？