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

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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