The______of medical knowledge are being pushed farther onwards as time goes on.

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问题 The______of medical knowledge are being pushed farther onwards as time goes on.

选项 A、front
B、border
C、frontiers
D、edge

答案C

解析 frontier n.(本义)边境,边界;边疆:(引申)(科学开拓的)新领域(beyond the frontier of knowledge;at the frontier of space exploration)。front n.前面,正面:前线,战线。border n.边界,边境;边缘,界线。edge n.边缘,棱;刀口。
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