B.diccover 是发现,找到的意思,即发现已经存在但不被人认知的事物.这句话的意思是全世界的科学家正致力于发现治疗艾滋病的方法.即治疗艾滋病的方法肯定是有,只不过是还没被人发现.
A.invent是发明,创造,即发明出来原来没有的东西
C.create 是创作的意思,一般指创作出来作品
D.produce 是生产的意思,生产某种产品
Scientists around the world are working to___the treatment o
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