简述生物修复三原则。
参考答案：
使用适合的微生物、在适合的地点和适合的环境条件下进行。
（1）适合的微生物（先决条件）：是指具有生理和代谢能力并能降解污染物的细菌和真菌。如果在反应器内处理高浓度有毒污染物，修复位点处有降解微生物存在。在多数情况下，则要加入外源微生物。
（2）适合的地点（场所）：是指要有污染物和合适的微生物相接触的地点。
（3）适合的环境条件：是指要控制或改变环境条件，使微生物的代谢和生长活动处于最佳状态。
（4）适合的技术费用：是指生物修复技术费用必须尽可能低。
| 完形填空。 | ||||
| Life today is 1 than it was hundreds of years ago, but it has 2 some new problems. One of the biggest problems is pollution. We can see it, smell it, drink it, and 3 hear it. 4 has polluted Earth. The more people, the more .because there were not 5 people. Now man is slowly polluting 6 world. Air pollution is still the most serious among (在……之中) all kinds of pollution. It is bad for all 7 animals. It is caused by heavy traffic. It is said that the situations will be much better if people ride bikes 8 driving cars. When you are riding, there is no pollution. But even in developing countries, most people don't go to work by bike. It is not because bikes are expensive or people are tired if they ride to work, but because the roads for the cars become 9 , more people put away their bikes and go to work by car or by bus, then things are getting 10 . | ||||
|