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 if it is necessary.

　　Many kinds of animals eat plants.The plants can not run away from their enemies.Some plants make poison.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.

　　Today farmers use many kinds of poison on their farms.Most of these poison 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.

　　()1.What's the greatest difference between animals，people and plants?

　　A.People and animals can kill but plants can't.

　　B.The plants can't run away from their enemies but animals and people can.

　　C.People，animals have enemies but plants don't.

　　D.Not mentioned in the passage.

　　()2.Which of the following is not mentioned?

　　A.The plants can make poison.

　　B.Where do the poisonous plants live.

　　C.How do some plants kill their enemies.

　　D.How do scientists make poison from plants.

　　()3.Why do scientists want to make poison from plants?

　　A.Because the poisons coming from petroleum are too expensive.

　　B.Because the poisons coming from petroleum are not useful.

　　C.Because the poisons coming from petroleum can kill people.

　　D.Because they are interested in them.

　　Key：1-3BDA

　　植物如何杀生？

　　人会杀生，动物也会杀生。动物和人杀生是为了食物，或者是为了杀死敌人。人和动物可以到处活动去找要杀的东西。他们可以跑开以躲避敌人。他们可以在必要的时候杀死敌人。

　　许多动物以植物为食。植物不能跑离躲避敌人。有些植物能产生毒素。如果动物吃了这种植物的一部分，它就会生病或是死去。动物学会离它们远远的。会产生毒素的植物有许多种，其中大多数生长在沙漠或者是热带地区。

　　今天，农民们在他们的农场上用各种方式的毒药。这些毒药大多数来自石油，但是石油很昂贵。科学家们采集有毒的植物并对它们加以研究。也许农民们可以使用来自植物的毒药，而不是来自石油的昂贵毒药。

　　(文/江苏海安姜红伟；英语辅导报高中一年级版03-04学年第20期；版权归英语辅导报社所有，独家网络合作伙伴新浪教育，未经许可，不得以任何形式进行转载。)