New digital mobile phones definitely produce less radiation, but that doesn’t ______ mean that they should be used without caution.A.relativelyB.obviouslyC.necessarilyD.generally
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C解析副词辨析。A相对地；B明显地；C必要地；D一般地；结合句意可知C正确。句意：新的手机产生的辐射无疑会少一点，但是他未必就意味着可以毫无顾忌的使用。