【正确答案】
A
【答案解析】该句意为:尽管人们对全球变暖忧心忡忡,但中国取得了明显的进步。该选项有些难。字典对amid的解释是:in the middle of,surrounded by或among,但实际用法并非如此,更接近于at a time of, in an atmosphere of(强调背景或形势),如He cancelled a foreign trip amid growing concerns of a domestic crisis或Amid all the confusion,the real point of the meeting was lost。介词over的意义之一是with reference to或concerning(有关……),经常用于某些名词后,如argument,concern,conflict,controversy,debate,depression,dispute,war。