人在行走时，若足踩在钉子上，就会迅速抬起腿来，其反射弧示意图如图．请回答：

（1）若受伤部位出血，说明至少伤至皮肤的____ 层。

（2）反射弧的结构中，a是____ ．完成上述反射的神经中枢位于脊髓的____ （结构）中。

（3）这种伤害性刺激产生的神经冲动传到大脑皮层的____ 中枢，就会产生痛觉。

（4）一车祸伤者，医生针刺其足底，患者无感觉但腿部反应非常明显，医生推断，受伤部位可能是____ 。

如图表示一个由三条多肽链形成的蛋白质分子，共含271个氨基酸，图中每条虚线表示由两个R基中的硫基（﹣SH）脱氢形成一个二硫键（﹣S﹣S一）．下列相关叙述不正确的是（    ）

阅读下列材料：
材料一：经历了近半个世纪的资产阶级革命，英国终于确立了代表新贵族和资产阶级利益的政治制度，走上了迅速发展资本主义的道路；并率先开始了工业革命。……
——摘自北师大版历史教材九年级上册
材料二：不论是水力还是风力，都要受到自然条件的限制，比如水力机器必须建立在河流旁，可并不是所有的地方都有河流，而且水的 多少也受到季节的限制……这样，人们开始研究可以提供更强大、更持久、更稳定、能在任何季节和地方使用的动力机器。
——摘自北师大版历史教材九年级上册
请回答下列问题：
(1)材料一可以看出英国发生了两场革命，资产阶级革命与工业革命，它们之间的内在联系是什么?
(2)材料二中提到的强大、稳定、持久的动力机器是什么？它的出现有什么重要意义？
(3)这场工业革命在交通领域有何重大变革？试举一例。
(4)这场工业革命使社会关系发生了什么变化?
(5)当我们欢呼工业革命发明给我们带来物质上的充裕与精神上的满足同时，随着时间的推移，人们发现我们的天空不再蓝了，河水不再绿了，这告诫我们在发展生产的同时，应该注意什么问题? 

    When I was a teenager growing up in Russia, I wanted to leave school and have my own life. The only way I could do this was to work in the local brick factory in my town, or get married. I was nervous when I told my father I wanted to leave school. I thought he would say, "No! You are going to college." He took me by surprise when he said, “OK. We'll go to the brick factory.”
    Two days later, he took me to the factory. I had a very romantic idea of working in a factory. I had imagined everyone to be friends working together and having fun. I even imagined there would be music and singing. I guess I had watched too many movies as a teenager.
    When we arrived at the factory gate, my father spoke to the guard and one minute later we were inside. My father said, “Take your time. Look around.” I walked around the factory looking at the building, the workers, and listening to the noise. It was horrible. I ran back to my father and said, “I want to go home.”
    He asked me, “What do you think of the factory?”
    "It's terrible," I replied.
    "And marriage is even worse!" he said.
    I went back to school the next day thinking about studying hard so I could get into a good college. I enjoyed studying English so I decided to major in languages at college. Thanks to my father and our trip to the brick factory, I now work at the United Nations and my father is very proud of me. I married a very good man and my life is much better than it would have been working in the factory!

取少量MgO、Al₂O₃、SiO₂、Fe₂O₃的混合粉末，加入过量盐酸，充分反应后过滤，得到沉淀X和滤液Y．下列叙述正确的是（   ）