题目内容：
根据下列文章,请回答题。Natural MedicinesSince earliest days。humans have used some kinds of medicines．We know thisbecause humans have survived．Ancient treatments for injury and disease’ were successfulenough to keep humans from dying out completely．They were successful long before the time of modern medicine．Before thetime of doctors with white coats and shiny(发亮的)instruments．Before the time ofbig hospitals with strange and wonderful equipment．
Many parts of the world still do not have university—educated doctors．Nordo they have expensive hospitals．Yet injures are treated．And diseases are oftencured．How? By ancient methods．By medicines that might seem mysterious。evenmagical(有魔力的)。Traditional medicines are neither mysterious nor magical。however．
Through the centuries。tribal(部族的)medicine men experimented with plants．Theyfound many useful chemicals in the plants．And scientists believe many of these traditionalmedicines may provide the cure for some of today’s most serous diseases．
Experts say almost 80%of the people in the world use plants for healthcare．These natural medicines are used not lust because people have no otherform of treatment．They are used because people trust them．In developed areas；fewpeople think about the source of the medicines they buy in a store．Yet manywidely-used medicines are from ancient sources，especially plants．Some expelssay more than 25%of mode J。n medicines come。In one way or another, from nature．
Scientists have long known that nature is really a chemical factory．Allliving things contain chemicals that help them survive．So scientists’ interestin traditional medicine is I new．But it has become an urgent concern．This isbecause the each’S supply of natural medicines may be dropping rapidly．The passage indicates that ancienttreatments for injury and disease were A．much more successful thanmodem one
B．successful enough for humansto surviv
C．successful all case
D．of little help to human
参考答案：
答案解析：