|aOxford bookworms library. Fantasy & horror. Stage 5.
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|aStage 5: 1800 headwords.
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|aWord count: 22,500.
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|aA human being is a soft, weak creature. It needs constant supplies of air, water, and food ; it has to spend a third of its life asleep, and it can't work if the temperature is too hot or too cold. But a robot is made of strong metal. It uses electrical energy directly, never sleeps, and can work in any temperature. It is stronger, more efficient - and sometimes more human than human beings.
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