3-C. According to the speaker, what is a problem for some GPS users?According to the speaker, what is a problem for some GPS users?
話し手によると、何ですか、問題は、いくつかのGPSユーザーにとってのダヨ?
4-C. Researchers wonder if over-reliance on GPS directions may affect the way some users' brains function.Researchers wonder if over-reliance on GPS directions may affect the way some users' brains function.