How Why4---How Can a Plant Kill?讲读版

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英文原文：

How Can a Plant Kill?

People kill. Animals kill. Animals and people kill for food, / or they kill their enemies. People and animals can move around / and find something to kill. They can run away / from an enemy. They can kill it / if it is necessary.

Many kinds of animals eat plants. The plants cannot run away / from their enemies. Some plants are poisonous. If an animal eats part of the plant, it gets sick or dies. Animals learn to stay away from these plants.There are many kinds of plants / that make poison. Most of them grow in the desert/ or in the tropics.

Farmers use many kinds of poison / on their farms. Most of these poisons come from petroleum, but petroleum is expensive. Scientists collect poisonous plants / and study them. Maybe farmers can use cheap poison from plants / instead of expensive poison from petroleum.