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阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

Everything that is alive needs energy. All animals get the energy they need from food. People are animals. Think about the human body as an  1.(amaze) machine. It can do all kinds of things for us. Food is the fuel 2. helps keep the machine 3.(run).

Plants use sunlight to make their own food. Animals are not able to do that. Some animals eat plants. Some animals eat other animals as meat. Some animals, like people, eat both plants 4. animals.

Since plants make their own food using sunlight, the sun’s energy is found in plants. The sun’s energy is very strong. It loses a lot of its 5.(strong) by the time it goes into a plant.

When we eat plants, we get 6.(much) of the sun’s energy than when we eat animals. That’s 7. it is good to eat fruits and vegetables. When an animal eats a plant, it gets less energy. The animal also used its energy 8.(find) the plant to eat. When a second animal eats the first animal, it gets even less energy than the first animal got. 9. second animal used a lot of energy to chase the first animal.

Like a car that has to10.(fill) with gasoline, living things have to eat again and again. Instead of gasoline, living things use food as fuel.

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