Since no one really knows what effects the GM food might have _____ us humans, many countries think that they should be cautious _____ this new technology.A.about; withB.on; toC.in; toD.on; with
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D解析试题分析：根据句意：因为没有人真正知道转基因食物可能对我们人类有什么影响，许多的国家认为他们呢应该对新技术抱以谨慎的态度。have effects on sth 对…有影响be cautious with sth 对…谨慎小心的be cautious to do sth 对做…谨慎小心的。故选D考点：固定短语
点评：像这种固定短语的题目，重在分析句子成分，调整语序，并看懂意思。另外此句出自课本原文，平时需对课本反复朗读加深印象。