2. Наиболее распространенный источник инфекции, источник болезни, древние люди, защитный наружный слой, подобный эффект, предотвращать, проксимальная поверхность, слизистая оболочка. 3. 1) Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis. Viruses. 2) The digestive functions of saliva include moistening food, and helping to create a food bolus, so it can be swallowed easily. Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus, digestion of food occurs within the mouth, even before food reaches the stomach. 3) the last line of defense is that position where the mission is to hold enemy forces and not allow them to pass. 4. through cuts on the skin, food, gastric juice, more favorable conditions, harmless, destruction
3. 1) Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis. Viruses.
2) The digestive functions of saliva include moistening food, and helping to create a food bolus, so it can be swallowed easily. Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus, digestion of food occurs within the mouth, even before food reaches the stomach.
3) the last line of defense is that position where the mission is to hold enemy forces and not allow them to pass.
4. through cuts on the skin, food, gastric juice, more favorable conditions, harmless, destruction
1. I have not seen him for ages.
2. He has been doing his lessons since lunch.
3. I have not heard about him for a long time.
4. I have been driving since I was 17.
5. Jack has failed his driving test three times because he doesn't know how to park.
6. I think he has made a lot of improvement.
7. Alice has not passed her driving test because she doesn’t know the rules well.
8. She has been worrying about this for two months.
9. She has been studying the driver’s manual for hours every day.
10. She hasn't taken another test yet
Объяснение: