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67.Выберите правильный вариант:
1. A modern chemist can/can not use the methods of physical chemistry.
2. You must/may use this apparatus very carefully.
3. You must/may use this equipment for your experiment.
4. The doctor can/must diagnose the disease instantly thanks to use of modern
equipment.
5. A pure substance can/should be a solid, a liquid, or a gas.
6. One can/can not cure the flu in 2 days.
68.Заполните пропуски модальными глаголами can, must, may,
should или их отрицательными формами (+ not):
1. We ______ understand the medical action of drugs without the knowledge
provided by chemistry.
2. Many people study chemistry so that they _____ apply it to their own field of
interest.
3. Unrefrigerated milk _____ turn sour.
4. The students of pharmacy _____ know chemistry well.
5. You _____ come for consultation on chemistry any time from 5 to 8.
6. Who _____ describe the properties of this matter?
7. Every person _____ have sodium to keep the right amount of water in his
body.
8. We _____ find Vitamin C in lemons, oranges and tomatoes.
9. You _____ drink it. It’s poison.
69.*Переведите предложения с модальными глаголами:
1. We could not investigate the ribosomes.
2. The electron microscope should be used to study living cells.
3. Can staining (окрашивание) show invisible structures?
4. The information provided by all the available techniques must be
combined.
5. The drug may be used in a general treatment programme.
6. Experiments such as these should help in the work.
7. The film should be developed for 1 min.
8. Tolerance may develop in some patients.
9. Spasm may be caused by various factors.
10. Ultraviolet light, fluorescence and sensitive television cameras must be
developed.
11. The variants can be identified by a variety of methods.
12. He could describe the properties of this substance.
13. A special reagent that coagulates blood must be used.
14. The normal heart rate may be about 70 beats per minute.
15. The doctor can detect an improvement in his patient’s condition.