2. 外语
  3. According to the passage, compared to 3G mobile phones, the second-generation phones ______. The passage mainly talks about ___

According to the passage, compared to 3G mobile phones, the second-generation phones ______. The passage mainly talks about ___

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问题 According to the passage, compared to 3G mobile phones, the second-generation phones ______.
The passage mainly talks about ______.
选项 A、the impact of mobile phone signals on health
B、the negative impact of current signals on health
C、the long-term effects of mobile phones on health
D、the possible causes of the impact of mobile phones
答案A
解析
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