材料一：在正常人的血浆中，NaHCO₃的含量约为H₂CO₃含量的20倍．当血浆中的NaHCO₃含量减少时，会发生酸中毒；当血浆中的H₂CO₃含量减少时，则发生碱中毒．

材料二：在初生蝌蚪或幼小植物体内，当自由水的比例减小时，机体代谢强度降低；当自由水的比例增大时，机体代谢强度升高．

材料三：Mg²⁺是叶绿素分子必需的成分；Fe²⁺是血红蛋白的重要成分；碳酸钙是动物和人体的骨骼和牙齿的主要成分．

材料四：人体某些组织的含水量近似，但形态却不同．例如，心肌含水量约为79%而呈坚韧的状态，脑中含水量约为84%而呈溶胶状．

材料五：血液在血管中呈液态，当血液从血管中流出后则会凝固．

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

      2）只允许修改10处，多者（从第11处起）不计分。

    My mother is a teacher work in a key high school. She is too busy that she often has to get up early and stay up late. In addition to this, she hardly has any times to take exercise. She has been on poor health for some time. My father and I are worried that she may fall ill if she works too hard. These days I'm thinking why to develop my mother's interest in playing sports. Considered that today is Mother's Day, I decided buy a pair of jogging shoes for her. I secret put them on the desk in her study. When my mother entered into her study this evening, she looked surprised, but she immediately realized my intention. She promises that she would go jogging every evening.

2015年9月，国务院常务会议决定中央财政出资150亿元，吸引民营和国有企业、金融机构、地方政府等共同参与，建立总规模为600亿元的国家中小企业发展基金，重点支持种子期、初创期成长型中小企业发展。设立国家中小企业发展基金表明政府（    ）

①扶持中小企业一积极组织经济建设

②是提高中小企业市场活力的主要因素

③有责任更多地介入中小企业的经营活动

④能够通过市场化手段影响微观经济活动

如图，以BC为公共边的三角形的个数是（　　）