New digital mobile phones definitely produce less radiation, but that doesn’t mean that they should be used without caution.
A. relatively
B. obviously
C. necessarily
D. generally
网友回答
A. relatively
B. obviously
(答案→)C. necessarily
D. generally
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。