1. (2020·杨浦模拟) 听独白，选择正确的答案。

1. （1） Choose the best answer

   A . Most of the electronic headbands sold online had turned out fakes. B . The headband was too expensive for the ordinary household. C . Complaints had been received that the headbands caused headaches. D . There had been a mixed reaction among different parties involved.
3. （2） Choose the best answer

   A . Its hidden device functions to keep students relaxed. B . It informs teachers and parents of students' study scores. C . It changes color based on the focus level of its wearers. D . It helps determine the wearer's overall intellectual capability.
5. （3） Choose the best answer

   A . Unauthorized access to students' private data. B . Lack of accuracy of the gathered information. C . The psychological burden upon the family. D . Negative impact on students' physical well-being.