New digital mobile phones definitely produce less radiation, but that doesn’t         mean that they should be used without caution.
A．generallyB．ultimatelyC．relativelyD．necessarily
D

試題分析：考查固定詞組。固定詞組Not necessarily未必，不一定就…；句意：先的手機(jī)的輻射一定會(huì)小一點(diǎn)，但是未必就意味著他們可以沒有顧忌地被使用。故D正確。
點(diǎn)評(píng)：固定詞組Not necessarily未必，不一定就…；
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