The Japanese will not be able to keep a lid on their high-tech know-how forever. Sooner or later they will begin to lose their 【edge】.
A、hope
B、heart
C、advantage
D、disadvantage
【正确答案】：C
【名师解析】:在题目中，"edge"一词指的是在某个领域或情境中的优势或领先地位。根据句子"The Japanese will not be able to keep a lid on their high-tech know-how forever. Sooner or later they will begin to lose their edge."，可以推断出日本人在高科技领域拥有的领先地位或优势将不会永远保持，他们最终会开始失去这一优势。因此，正确答案是选项C，即"advantage"。其他选项A、B和D分别代表"希望"、"心"和"不利"，这些选项与句子的语境不符。
