2. 外语
  3. According to the passage, compared to 3G mobile phones, the second-generation phones ______. The double-blind laboratory tests

According to the passage, compared to 3G mobile phones, the second-generation phones ______. The double-blind laboratory tests

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问题 According to the passage, compared to 3G mobile phones, the second-generation phones ______.
The double-blind laboratory tests means ______.
选项 A、nobody taking part in the test knows if the 3G base station is transmitting signals
B、only the subjects in the test know if the 3G base station is transmitting signals
C、no researchers know if the 3G base station is transmitting signals
D、everyone in the test knows if the 3G base station is transmitting signals
答案A
解析
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