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Since earliest days, humans have used some kinds of medicines. We know this because humans have survived. Ancient treatments for injury and disease were successful enough to keep humans from dying out completely. They were successful long before the time of modern medicine. Before the time of doctors with white coats and shiny instruments. Before the time of big hospitals with strange and wonderful equipment. Through the centuries, tribal medicine men experimented with plants. They found many useful chemicals in the plants. And scientists believe many of these traditional medicines may provide the cure for some of todays most serious diseases. Scientists have long known that nature is really a chemical factory. All living things contain chemicals that help them survive. So scientists interest in traditional medicine is not new. But it has become an urgent concern. This is because the earths supply of natural medicines may be dropping rapidly. 1 The passage indicates that ancient treatments for injury and disease were B successful enough for humans to survive. D of little help to humans. A Modern medicines are now available all over the world. C Traditional medicines are neither mysterious nor magical. 3 It is believed by scientists that traditional medicines B may cure some of todays most serious diseases | 
