Since no one really knows what effects the GM food might have us humans, many countries t

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; with
B. on; to
C. in; to
D. on; with

A. about; withB. on; toC. in; to(答案→)D. on; with解析：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

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