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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

试题分析:考查固定词组。固定词组Not necessarily未必,不一定就…;句意:先的手机的辐射一定会小一点,但是未必就意味着他们可以没有顾忌地被使用。故D正确。
点评:固定词组Not necessarily未必,不一定就…;
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