Choose the correct word(s) in bold. Think of two more task sentences.

1. The cat’s maximum recordeddeath rate/life spancan reach 36 years.

2. People hope that new medicine foraging/ rejuvenation will be found in the future.

3. Unfortunately, medical care/ death rates of lab mice during the experiment was quite high.

4.

5.

3. Answer the questions:

1. Why is average life span increasing worldwide?

2. What does degenerative build-up mean?

3. Why do we live as long as we do?

4. What discovery was made by Tom Johnson and Michael Klass?

5. What phenomenon is called apoptisis?

The passive is formed by using the appropriate tense of the verb to be + past participle. Present perfect continuous, past perfect continuous, future continuous are not normally used in the passive.

1. Find nine examples of Passive Voice in the text (see Reading 1) and define their forms.

Read and translate the sentences, find the verbs and decide if they are used in Active or Passive Voice.

1. The idea was advanced on purely theoretical grounds. 2. You have forgotten to switch off the device and it has been spoiled. 3. Considerable progress will be made in this field in the nearest future. 4. The experiments presented are typical of our research. 5. This substance is characterized by a number of properties. 6. An electron device will operate correctly only for the time that the cathode emits electrons in the quantity required by the interaction process. 7. Bohr assumed that electrons could move about the nucleus only in certain orbits or discrete energy levels. 8. Penicillin was discovered by accident by Alexander Fleming, who noticed that bacteria in Petri dishes were being killed by the mold which had formed there. 9. I am interested in nuclear physics. 10. The measurements are being done in our lab to verify the theory.

3. Write the sentences in the passive:

1. The time machine / not invent / yet. 2. The joint research project / carry out / now. 3. The motion of planets / study / by Galileo. 4. Electrical energy / transmit / over great distances. 5. For many years the energy of the wind or running water / use / to get electricity. 6. When we entered the room the telescope / repair. 7. Velocity/ distinguish/from speed. 8. This experiment/ finish/ next week. 9. The Earth attracts and/ attract/ by the Moon. 10. Since the discovery of isotopes their practical usage/ expand/ greatly. 11. In future a space craft/ launch/ to Mars. 12. The accelerator/ repair/ by the end of the month. 13. The laser broke down while the experiment/ conduct/.

Date: 2015-12-11; view: 844