According to paragraph 1, Richard Perez has manage...

C

- Hướng dẫn giải

He lives "off-grid" - unconnected to the power grid and the water, gas and sewerage supplies that most people in the world rely on. He generates his own electricity, sources his own water and deals with his own waste disposal - and he prefers it that way. "There are times when the grid blacks out," he says. "I really like the security of having my own electricity company."