background reading 背景阅读 1、 why save endangered species? when hearing of saving endangered species with the high cost of money and energy, perhaps you will doubt whether it is worth such effort. in fact, plants and animals hold many aspects of value. endangered species must be protected and saved so that future generations can experience their presence and value. medicinal (医学的) plants and animals are used in many medications. in fact, about forty percent of all medicines
