Complete the sentences using the correct variant . 1. A nuclear reactor is used in a) wind - power plants b) atomic power plants 2. A nuclear reactor is cooled by a) water circulating in tubes b) oil circulating in tubes 3. Water is passed into the reactor a) at a low pressure b) at a high pressure 4. High pressure a) activates boiling of water b) prevents boiling of water 5. Atomic power plants a) pollute the air with dust and smoke b) don’t pollute the air with dust and smoke 6. Circulating water flows a) inside the heat exchangers b) outside the heat exchangers 7. Attending personnel is shielded by a) thick concrete walls b) thick metal walls