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

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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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