The ______ of medical knowledge are being pushed farther outwards as time goes o

游客2023-07-14  23

问题 The ______ of medical knowledge are being pushed farther outwards as time goes on.

选项 A、edges
B、borders
C、boundaries
D、frontiers

答案 D

解析 医学知识的前沿正随着时间向前推进。edge意为“边缘;刀口;优势”;bolder“边境,国界”;boundary“边界,分界线”;frontiers意为“边界,边境;(the frontier)开发地区的边缘,边远地区;(常pl.)前沿,新领域”。
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