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6.We need to master this technology immediately,______ we will fall behind.(  )
A.butB.orC.soD.and

分析 我们需要立即掌握这个技术,否则我们会落后.

解答 答案:B
根据句意,"We need to master this technology immediately""我们必须掌握技术"可知,"or"意为"否则的话"符合题意."but"表示转折,so意为因此,and并列连词.

点评 考查连词,考生需联系上下文做出判断.

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