写出下列物质在水溶液中的电离方程式：
H2SO4______Ba（OH）2______AlCl3______Fe2（SO4）3______．
H2SO4在溶液中完全电离生成H+和SO42-离子，电离方程式为H2SO4=2H++SO42-，
Ba（OH）2在溶液中完全电离生成Ba2+和OH-离子，电离方程式为Ba（OH）2=Ba2++OH-，
AlCl3 在溶液中完全电离生成Al3+和Cl-离子，电离方程式为AlCl3=Al3++3Cl-，
Fe2（SO4）3在溶液中完全电离生成Fe3+和SO42-离子，电离方程式为Fe2（SO4）3=2Fe3++3SO42-，
故答案为：H2SO4=2H++SO42-；Ba（OH）2=Ba2++OH-；AlCl3=Al3++3Cl-；Fe2（SO4）3=2Fe3++3SO42-．
| 阅读下面短文，把A-D填入文中空缺处（1－4），使短文内容完整正确，然后完成第5题。 | |
| Nowadays, more and more young people are becoming vegetarians in most Western countries. They are thought of as vegetarians and they refused to eat meat, fish, eggs, cheese and milk. 1 . Some of them just don’t eat animal products such as milk, eggs, or yogurt, but some others are strict vegetarians and they eat mainly fruit and vegetables. As we know, it is very important to have a balanced diet, especially for the teenagers who are growing up. 2 . Well, each person chooses to become a vegetarian for different reasons. The main reasons are they want to protect animals and they want to stay healthy. I decided to be a vegan when I was 15 years old. But as a vegetarian, I have had a difficult time in getting the proper nutrition(营养). 3 . Of course, being a vegetarian isn’t for everyone. 4 .
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| 5. Which of the following is NOT true？ | |
| A. There are many vegetarians in most Western countries. B. The main reason for being vegetarians is they don’t like eating meat. C. Not everyone should be a vegetarian. D. Keeping healthy is important to teenagers. |