Animals in Dangers

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"What do tigers, whales, wolves, and deer have in common? They are all animals in danger of extinction. Tehy have many natural enemies, but man is their principal problem. In many countries, men (women and children, too) pollute the air, rivers, seas, beaches, and valleys with their industries. They take land and food from the animals when they build their cities, roads and farms. People kill animals to make coats, shoes and bags, or just to put them on walls for decoration." [in Lesson 3, in English for Life de Aamdeu Marques]