試題詳解

43. According to the passage, which of the following is an advantage of Li-Fi over Wi-Fi?
(A) Li-Fi can be powered by radio and save more energy.
(B) Li-Fi guides pedestrians in areas where vehicles cannot travel.
(C) Li-Fi provides safer transmission of data during a power failure.
(D) Li-Fi can be used in areas where Wi-Fi may interfere with radar signals.