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．

改正下面的句子。

①在联欢会上，李丽演唱了动听的歌声。

②小鸟动听的歌声被他陶醉了。

③全班同学都去看电影了，只有张军一个人还留在教室里做作业。

④我不禁忍不住笑出声来。

阅读下面有关甲肝的资料，分析回答下列问题：

甲型病毒性肝炎（简称甲肝）是一种由甲肝病毒引起的急性传染病．我国为高发区，其发病为各型肝炎的首位．甲肝病人或携带甲肝病毒的人，其粪便里就有甲肝病毒，这些病毒一旦污染了饮水、食物、蔬菜或日常家庭用具等，没有感染过甲肝病毒的健康人，通过饮水和食物等途径，会导致甲肝病毒进入体内而感染．

地壳运动改变着地球表面的基本形态，褶皱构造可形成（     ）

A

    Do you know the movie Zootopia? Have you seen it? Do you like it? Let me introduce some of the characters for you.

Name: Nick

Animal type: North American red fox

Weight: 7kg

Favorite food: mouse

Interesting fact: Red foxes are good at swimming and climbing trees.

Name: Judy Hopps

Animal type: North American rabbit

Weight: 1kg

Favorite food: grass

Interesting fact: A female rabbit can have fifty baby rabbits every year. So in the movie, Judy has two hundred and seventy-five brothers and sisters.

Name: Mayor Lionheart

Animal type: African lion

Weight: 300kg

Favorite food: beef

Interesting fact: Lions usually sleep in the day and look for food in the night.

Name: Flash

Animal type: South American sloth

Weight: 6kg

Favorite food: leaves

Interesting fact: It takes a sloth a month to move two kilometers. And it eats only one or two times a week.