The single market is central to the community's progress,but it is by no means certain that it could stand alone.
The single market is central to the community's progress,but it is by no means certain that it could stand alone.
A、key
B、simple
C、middle
D、trivial
【正确答案】：A
【名师解析】:题目中的关键词"central"意味着"核心的"或"中心的"。根据题目内容，"The single market is central to the community's progress"表明单一市场对于社区的进步至关重要。选项A中的"key"与题目中的"central"意义相近，都强调了某物的重要性和核心地位。因此，选项A是正确答案。其他选项B、C和D与题目中的"central"意义不符，分别表示"简单的"、"中间的"和"微不足道的"，与题目内容不匹配。
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